Teacher Guide
Week 17
Measurement: Length & Comparing — Teacher Guide
Monday: Measuring with an Inch Ruler
1
Warm-up
1.
12, 8, 15, 7
2
Ruler Basics
1.
Emphasize lining up the 0 end; common error is starting at 1
3
Measure in Inches
1.
A=2 in, B=4 in, C=3 in, D=5 in
4
Number Talk
1.
D is longer — it stretches farther; pencil is about 3 inches longer (7−4)
5
Challenge
1.
Any real objects; check ruler technique, not exactness
Page break
Tuesday: Estimating & Measuring in Centimeters
1
Warm-up
1.
16, 7, 15, 8
2
Centimeters
1.
Fingertip ≈ 1 cm benchmark
3
Estimate First
1.
A=5 cm, B=9 cm, C=3 cm, D=7 cm; praise estimates within 2 cm
4
Best Unit
1.
ant=cm, door=feet (or meters), shoe=inches, soccer field=meters
5
Word Problem
1.
30−12 = 18 cm
Page break
Wednesday: Measuring Twice
1
Warm-up
1.
7, 14, 5, 13
2
Measure Twice
1.
A: 2 in / 4 cm; B: 4 in / 8 cm; C: 3 in / 6 cm (printed scale)
3
Number Talk
1.
Centimeters are smaller units, so it takes MORE of them to cover the same line
4
How Much Longer
1.
17 cm, 26 inches, 33 cm, 48 inches
5
Create Your Own
1.
Any line; celebrate estimates within 1 inch of 4
Page break
Thursday: Length Word Problems
1
Warm-up
1.
18, 9, 13, 9
2
Estimate First (Real Objects)
1.
Paper width ≈ 8.5 in; other answers vary — check reasonableness
3
Word Problems
1.
63−38 = 25 cm added; 72−45 = 27 inches empty; 34+19 = 53 inches
4
Two Ways
1.
50−23 = 27 cm; counting up: 23→30 is 7, 30→50 is 20, total 27
5
Create Own
1.
Accept student problems with correct solution
Page break
Friday: Review & Self-Check
1
Warm-up
1.
7, 17, 8, 13
2
Estimate First
1.
A=4 cm, B=8 cm (printed scale)
3
Mixed Review
1.
5 inches taller; meters; 13 cm; 24 inches
4
Word Problem
1.
47+29 = 76 cm
5
Self-Check
1.
Accept student self-assessment and reflection