#!/usr/bin/env python3 """ Week 19: Money — Adding & Making Change Phase 3: Measurement, Time & Money Standards: 2.MD.C.8 (solve word problems involving money, $ and ¢ symbols) New Standard: - Reduced drill (40% fewer problems) - Estimation before calculating (about how much together? enough money?) - Multiple strategies encouraged (count up to make change vs. subtract) - Better word problems (real store transactions, reasoning over keywords) - Real challenges (open-ended thinking — plan a purchase) - Number talks (compare totals & change without calculating) - Friday self-check with reflection - Fact fluency warmup daily (coin values, make-a-dollar facts) - Word problems every day """ import os import glob from weasyprint import HTML from math_helpers import ( CSS, TEACHER_CSS, page, page_multi, hdr, sec, b, bw, bl, tg_page_multi, tg_sec, tg_note, tg_section_title, coin_svg, col_add, col_sub, ) from activity_builders import ( build_money_adding, ) BASE = os.path.expanduser("~/Home_School/2nd_Grade/Math") WEEK = os.path.join(BASE, "Week_19") # ═══════════════════════════════════════════════════ # MONDAY — Adding Two Money Amounts # ═══════════════════════════════════════════════════ def monday(): # 1: Fluency warmup — coin value facts (review from Week 18) s1 = '

'\ '

2-min Fluency Warm-up — Quick coin facts.

'\ '

' for q in ["2 quarters = ___¢", "3 dimes = ___¢", "4 nickels = ___¢", "quarter + dime = ___¢"]: s1 += f'

{q}

' s1 += '

' # 2: Adding two prices — guided intro s2 = '

Adding money works just like adding numbers! 25¢ + 30¢: add the cents like 25 + 30 = 55, so 55¢. '\ 'If your total reaches 100¢, that\'s $1.00!

' s2 += '

Example: A pencil costs 25¢ and an eraser costs 30¢.

25¢ + 30¢ = 55¢ together.

' s2 += '

Example: A sticker costs 60¢ and a card costs 40¢.

60¢ + 40¢ = 100¢ = $1.00!

' s2 += '

' # 3: Add the prices (reduced from 8 to 4) s3 = '

Add each pair of prices.

'\ '

' for a, c in [(25, 30), (15, 40), (35, 25), (45, 20)]: s3 += f'

{a}¢ + {c}¢ = {b("4em")}¢

' s3 += '

' # 4: Number Talk — Explain WITHOUT calculating s4 = '

'\ '

Number Talk — Explain WITHOUT calculating.

'\ '

' s4 += '

A: 25¢ + 25¢ B: 25¢ + 35¢

Which total is bigger? How do you know without adding?

My thinking: ' + bw() + '

' s4 += '

Toy A costs 49¢. Toy B costs 51¢. About how much do they cost together — is it about $1? Why?

My thinking: ' + bw() + '

' s4 += '

' # 5: Word problem s5 = '

'\ '

Read carefully. Think about what is happening.

'\ '

At the school store, Nora buys a bookmark for 35¢ and a pencil grip for 25¢. '\ 'How much does she spend in all? Show your thinking.

'\ '

Draw or write your thinking: ' + bw() + '

'\ '

Total: ' + b("4em") + '¢

' return page(19, "Monday", "Adding Money Amounts", f'''{sec(1, "Warm-up: Coin Facts", s1)} {sec(2, "Adding Prices Together", s2)} {sec(3, "Add the Prices", s3)} {sec(4, "Number Talk: Compare Totals", s4)} {sec(5, "Word Problem", s5)}''') # ═══════════════════════════════════════════════════ # TUESDAY — Estimation + Column Adding with Money # ═══════════════════════════════════════════════════ def tuesday(): # 1: Fluency warmup — make a dollar s1 = '

'\ '

2-min Fluency Warm-up — How much more to make $1.00?

'\ '

' for n in [75, 50, 90, 25]: s1 += f'

{n}¢ + {b("3em")}¢ = $1

' s1 += '

' # 2: Estimate First! — enough money? s2 = '

'\ '

Estimate First! Round each price to the nearest ten. Estimate the total, then add exactly.

'\ '

' for a, c in [(38, 21), (47, 32), (19, 43), (52, 28)]: at = (a + 5) // 10 * 10 ct = (c + 5) // 10 * 10 s2 += f'

{a}¢ + {c}¢

'\ f'

Round: {at}¢ + {ct}¢

'\ f'

Estimate: {b("4em")}¢

'\ f'

Actual: {b("4em")}¢

' s2 += '

' # 3: Column addition with money (reduced from 6 to 4) s3 = '

Line up the cents and add — just like column addition!

' s3 += '

' for a, c in [(38, 21), (47, 32), (19, 43), (52, 28)]: s3 += f'

{col_add(a, c)}

answer in ¢

' s3 += '

' # 4: Two items from the store (reduced from 4 to 2) s4 = '

'\ '

Store prices: apple 30¢ | juice 45¢ | cookie 25¢ | muffin 55¢

'\ '

' combos = [("an apple and a juice", "30¢ + 45¢"), ("a cookie and a muffin", "25¢ + 55¢")] for what, expr in combos: s4 += f'

How much for {what}?

{expr} = {b("4em")}¢

' s4 += '

' # 5: Word problem s5 = '

'\ '

Read carefully. Think about what is happening.

'\ '

Eli has 80¢. He wants to buy a juice (45¢) and a cookie (25¢). '\ 'Estimate first: does he have enough? Then add exactly to check.

'\ '

Estimate: ' + bw() + '

'\ '

Exact total: ' + b("4em") + '¢ Enough? ' + b("3em") + '

' return page(19, "Tuesday", "Estimating and Adding Money", f'''{sec(1, "Warm-up: Make a Dollar", s1)} {sec(2, "Estimate First!", s2)} {sec(3, "Column Adding with Cents", s3)} {sec(4, "Shopping for Two Items", s4)} {sec(5, "Word Problem", s5)}''') # ═══════════════════════════════════════════════════ # WEDNESDAY — Making Change (Count Up!) # ═══════════════════════════════════════════════════ def wednesday(): # 1: Fluency warmup s1 = '

'\ '

2-min Fluency Warm-up — Jump to the next ten.

'\ '

' for n in [37, 62, 85, 41]: s1 += f'

{n} + {b("3em")} = {((n // 10) + 1) * 10}

' s1 += '

' # 2: What is change? — guided, with count-up strategy s2 = '

Change is the money you get back when you pay more than the price. '\ 'Strategy: count UP from the price to what you paid.

'\ '

Example: A toy costs 35¢. You pay with 2 quarters (50¢).

'\ '

Count up: 35¢ → 40¢ (that\'s 5¢) → 50¢ (that\'s 10¢ more). Change = 5 + 10 = 15¢.

' # 3: Make change (reduced from 8 to 4) s3 = '

Count up from the price to the amount paid. Write the change.

'\ '

' for price, paid in [(40, 50), (65, 75), (30, 50), (55, 100)]: paid_label = "$1.00" if paid == 100 else f"{paid}¢" s3 += f'

Price: {price}¢ Paid: {paid_label}

'\ f'

Change: {b("4em")}¢

' s3 += '

' # 4: Two Ways — change by counting up AND subtracting s4 = '

'\ '

Two Ways — Find the change two different ways. Do they match?

'\ '

' for price, paid in [(45, 60), (25, 50)]: s4 += f'

Price {price}¢, paid {paid}¢

'\ f'

Strategy 1 — count up: ' + bw() + '

'\ f'

Strategy 2 — subtract {paid} − {price}: ' + b("4em") + '

'\ f'

Change: {b("4em")}¢

' s4 += '

' # 5: Challenge — Create Your Own s5 = '

'\ '

Create Your Own

'\ '

Invent an item for your own store. Give it a price under 50¢. A customer pays with 2 quarters. '\ 'Draw your item, write the price, and figure out the change.

'\ '

Draw your item here

'\ '

Price: ' + b("3em") + '¢ Paid: 50¢ Change: ' + b("3em") + '¢

'\ '

Strategy I used: ' + bw() + '

'\ '

' return page(19, "Wednesday", "Making Change", f'''{sec(1, "Warm-up: Next Ten", s1)} {sec(2, "What Is Change? Count Up!", s2)} {sec(3, "Make the Change", s3)} {sec(4, "Two Ways to Find Change", s4)} {sec(5, "Challenge: Create Your Own", s5)}''') # ═══════════════════════════════════════════════════ # THURSDAY — Store Transactions (Word Problems) # ═══════════════════════════════════════════════════ def thursday(): # 1: Fluency warmup s1 = '

'\ '

2-min Fluency Warm-up — Change from a quarter (25¢).

'\ '

' for price in [20, 15, 10, 5]: s1 += f'

Price {price}¢ → change {b("3em")}¢

' s1 += '

' # 2: Better word problems — real transactions (reduced from 5 to 3) s2 = '

'\ '

Read carefully. Think about what is happening in the situation. Draw coins if it helps!

'\ '

' problems = [ "Maya buys a hair clip for 40¢ and a ring for 35¢ at the craft fair. She pays with a $1 bill. How much does she spend, and how much change does she get?", "Owen has 3 quarters. He buys a bouncy ball for 55¢. Does he have enough? If yes, how much change should he get?", "Two friends each buy a 30¢ snack. They pay together with 3 quarters. Is that enough money? Explain.", ] for text in problems: s2 += f'

{text}

'\ '

Draw or write your thinking: ' + bw() + '

'\ '

Answer: ' + bw() + '

' s2 += '

' # 3: Two-step transaction s3 = '

'\ '

Solve step by step. Write each answer as you go.

'\ '

Ivy starts with 90¢. She buys a sticker for 25¢. '\ 'Then she buys a lollipop for 30¢. How much money does Ivy have left?

'\ '

Step 1: 90¢ − 25¢ = ' + b("4em") + '¢

'\ '

Step 2: ' + b("4em") + '¢ − 30¢ = ' + b("4em") + '¢

'\ '

Ivy has ' + b("4em") + '¢ left.

' # 4: Number Talk — Explain WITHOUT calculating s4 = '

'\ '

Number Talk — Explain WITHOUT calculating.

'\ '

' s4 += '

A toy costs 48¢. Jen pays 50¢, Kim pays $1. Who gets MORE change? How do you know without figuring out either amount?

My thinking: ' + bw() + '

' s4 += '

Two items cost 45¢ and 45¢. Will a $1 bill be enough? Reason without adding exactly.

My thinking: ' + bw() + '

' s4 += '

' # 5: Create your own word problem s5 = '

'\ '

Create Your Own Word Problem

'\ '

Write a store word problem where someone buys something and gets change. Then solve it.

'\ '

Answer: ' + bl() + '

'\ '

' return page(19, "Thursday", "Store Transactions", f'''{sec(1, "Warm-up: Change from a Quarter", s1)} {sec(2, "Word Problems: Think About What Is Happening", s2)} {sec(3, "Two-Step Transaction", s3)} {sec(4, "Number Talk: Reasoning About Change", s4)} {sec(5, "Challenge: Create Your Own", s5)}''') # ═══════════════════════════════════════════════════ # FRIDAY — Review & Self-Check # ═══════════════════════════════════════════════════ def friday(): # 1: Fluency warmup s1 = '

'\ '

2-min Fluency Warm-up — Money facts. Go fast!

'\ '

' for q in ["50¢ + 50¢ = $___", "75¢ + 25¢ = $___", "60¢ + 20¢ = ___¢", "30¢ + 30¢ = ___¢"]: s1 += f'

{q}

' s1 += '

' # 2: Estimate First! — review s2 = '

'\ '

Estimate First! Round to tens, estimate the total, then add exactly.

'\ '

' for a, c in [(29, 42), (53, 18), (36, 37), (41, 24)]: at = (a + 5) // 10 * 10 ct = (c + 5) // 10 * 10 s2 += f'

{a}¢ + {c}¢

'\ f'

Estimate ({at} + {ct}): {b("4em")}¢

'\ f'

Actual: {b("4em")}¢

' s2 += '

' # 3: Mixed money review — add and make change (reduced from 8 to 4) s3 = '

Use any strategy you prefer — count up or subtract.

'\ '

' s3 += f'

35¢ + 45¢ = {b("4em")}¢

' s3 += f'

Price 60¢, paid 75¢. Change: {b("4em")}¢

' s3 += f'

20¢ + 55¢ = {b("4em")}¢

' s3 += f'

Price 45¢, paid $1.00. Change: {b("4em")}¢

' s3 += '

' # 4: Word problem review s4 = '

'\ '

Read carefully. Show your thinking.

'\ '

' problems = [ "Ben buys a granola bar for 55¢ and pays with 3 quarters. How much change does he get?", "Ella has 50¢. Pencils cost 20¢ each. Can she buy two pencils? How much will she have left?", ] for text in problems: s4 += f'

{text}

'\ '

My thinking: ' + bw() + '

'\ '

Answer: ' + bw() + '

' s4 += '

' # 5: Self-check with emoji reflection s5 = '

'\ '

Self-Check: How do you feel about adding money and making change?

'\ '

Adding Money Amounts

'\ '

😊 I got it! | 😐 Getting there | 😟 Need help

'\ '

Making Change (Count Up)

'\ '

😊 I got it! | 😐 Getting there | 😟 Need help

'\ '

Store Word Problems

'\ '

😊 I got it! | 😐 Getting there | 😟 Need help

'\ '

One thing I learned this week: ' + bl() + '

'\ '

One thing I want to practice more: ' + bl() + '

'\ '

My favorite strategy for making change: ' + bl() + '

'\ '

' return page(19, "Friday", "Week 19 Review & Self-Check", f'''{sec(1, "Warm-up: Money Facts", s1)} {sec(2, "Estimate First!", s2)} {sec(3, "Add & Make Change Review", s3)} {sec(4, "Word Problems", s4)} {sec(5, "Self-Check & Reflection", s5)}''') # ═══════════════════════════════════════════════════ # TEACHER GUIDE # ═══════════════════════════════════════════════════ def teacher_guide(): return tg_page_multi( "Week 19", "Money: Adding & Change — Teacher Guide", tg_section_title("Monday: Adding Money Amounts") + tg_sec(1, "Warm-up coin facts", ["50¢, 30¢, 20¢, 35¢"]) + tg_sec(2, "Adding Prices (guided)", ["Read together"]) + tg_sec(3, "Add the Prices", ["55¢, 55¢, 60¢, 65¢"]) + tg_sec(4, "Number Talk", ["B is bigger — same first addend, 35 > 25", "Yes, about $1 — 49 is almost 50 and 51 is just over 50"]) + tg_sec(5, "Word Problem", ["35 + 25 = 60¢"]) + tg_note("Page break"), tg_section_title("Tuesday: Estimating and Adding Money") + tg_sec(1, "Warm-up make $1", ["25¢, 50¢, 10¢, 75¢"]) + tg_sec(2, "Estimate First", ["Est 60, actual 59 / Est 80, actual 79 / Est 60, actual 62 / Est 80, actual 80"]) + tg_sec(3, "Column Adding", ["59, 79, 62, 80"]) + tg_sec(4, "Shopping", ["75¢, 80¢"]) + tg_sec(5, "Word Problem", ["45+25=70¢ — yes, 80¢ is enough (10¢ left)"]) + tg_note("Page break"), tg_section_title("Wednesday: Making Change") + tg_sec(1, "Warm-up next ten", ["3, 8, 5, 9"]) + tg_sec(2, "Count Up (guided)", ["Model counting up on a number line"]) + tg_sec(3, "Make Change", ["10¢, 10¢, 20¢, 45¢"]) + tg_sec(4, "Two Ways", ["45→60: change 15¢ both ways", "25→50: change 25¢ both ways"]) + tg_sec(5, "Create Own", ["Accept any price <50¢ with correct change from 50¢"]) + tg_note("Page break"), tg_section_title("Thursday: Store Transactions") + tg_sec(1, "Warm-up change from 25¢", ["5¢, 10¢, 15¢, 20¢"]) + tg_sec(2, "Word Problems", ["Spends 75¢, change 25¢ from $1", "75¢ ≥ 55¢ yes; change 20¢", "Snacks 60¢, paid 75¢ — yes, enough (15¢ left)"]) + tg_sec(3, "Two-Step", ["Step 1: 90−25=65¢; Step 2: 65−30=35¢ left"]) + tg_sec(4, "Number Talk", ["Kim — she paid more for the same price", "Yes — 45 is less than 50, and 50+50=100, so 45+45 < $1"]) + tg_sec(5, "Create Own", ["Accept student-created transaction problems"]) + tg_note("Page break"), tg_section_title("Friday: Review & Self-Check") + tg_sec(1, "Warm-up", ["$1.00, $1.00, 80¢, 60¢"]) + tg_sec(2, "Estimate First", ["Est 70, actual 71 / Est 70, actual 71 / Est 80, actual 73 / Est 60, actual 65"]) + tg_sec(3, "Add & Change Review", ["80¢; 15¢; 75¢; 55¢"]) + tg_sec(4, "Word Problems", ["75−55=20¢ change", "Yes — 2 pencils = 40¢, 10¢ left"]) + tg_sec(5, "Self-Check", ["Accept student self-assessment and reflection"]) ) # ═══════════════════════════════════════════════════ # GENERATE # ═══════════════════════════════════════════════════ if __name__ == "__main__": os.makedirs(WEEK, exist_ok=True) for f in glob.glob(os.path.join(WEEK, "*.pdf")): os.remove(f) for f in glob.glob(os.path.join(WEEK, "*.html")): os.remove(f) days = [ (monday, "Monday", "Adding Money Amounts"), (tuesday, "Tuesday", "Estimating and Adding Money"), (wednesday, "Wednesday", "Making Change"), (thursday, "Thursday", "Store Transactions"), (friday, "Friday", "Week 19 Review & Self-Check"), ] for lesson_func, day, title in days: html = lesson_func() fname = f"Week_19_{day}" path = os.path.join(WEEK, f"{fname}.html") with open(path, "w") as f: f.write(html) pdf_path = os.path.join(WEEK, f"{fname}.pdf") HTML(filename=path).write_pdf(pdf_path) print(f"Generated: {pdf_path}") html = teacher_guide() path = os.path.join(WEEK, "Week_19_Teacher_Guide.html") with open(path, "w") as f: f.write(html) pdf_path = os.path.join(WEEK, "Week_19_Teacher_Guide.pdf") HTML(filename=path).write_pdf(pdf_path) print(f"Generated: {pdf_path}") print("\nWeek 19 (Money: Adding & Change, new standard) complete!")