Teacher Guide
Week 11
Mixed 2-Digit Addition & Subtraction — Teacher Guide
Monday: Decide: Add or Subtract?
1
Warm-up ±10
1.
52, 65, 46, 78
2
Number Talk
1.
ADD (getting more), SUBTRACT (flying away), ADD (adding more), SUBTRACT (eating)
3
Mixed Practice
1.
63, 44, 83, 46
4
Missing Numbers
1.
7, 27, 48, 34
5
Challenge
1.
Various — accept any interesting problems
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Tuesday: Multiple Strategies
1
Warm-up
1.
63, 68, 300, 300
2
Estimation
1.
Est 40+30=70, actual 65 / Est 70−30=40, actual 37 / Est 40+40=80, actual 83 / Est 80−40=40, actual 46
3
Two Strategies
1.
73, 35, 93, 46
4
Word Problems
1.
55 brushes (36+27−8), 72 passengers (84−31+19)
5
Number Talk
1.
Same sum (45+38 = 48+35 = 83)
2.
72−24 is bigger (subtracting less)
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Wednesday: Problem Solving
1
Warm-up
1.
57, 44, 45, 33
2
Column Practice
1.
63, 83, 44, 46
3
Word Problems
1.
92 cookies, 48 books, 65 marbles
4
Find Error
1.
28+45=73 not 63 (forgot to carry 1)
2.
64−37=27 not 33 (borrowing error)
5
Even/Odd
1.
63(odd), 35(odd), 83(odd)
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Thursday: Application & Challenges
1
Warm-up
1.
71, 53, 500, 200
2
Real-World Problems
1.
97 animals (89+23−15), 38 pages (100−34−28), 54 vegetables (67+45−58)
3
Number Talk
1.
56+36=92 (two more)
2.
93−27=66 (ten more)
4
Two-Step
1.
Step 1: 48+27=75, Step 2: 75−19=56 crayons
5
Create Own
1.
Accept student-created two-step problems
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Friday: Review & Self-Check
1
Warm-up
1.
66, 62, 400, 400
2
Estimation
1.
Est 50+40=90, actual 84 / Est 70−30=40, actual 45 / Est 60+40=100, actual 94 / Est 90−50=40, actual 45
3
Mixed Review
1.
82, 46, 85, 39
4
Word Problems
1.
90 benches, 35 bars
5
Self-Check
1.
Accept student self-assessment and reflection