Teacher Guide
Week 5
Subtraction Facts to 20 — Teacher Guide
Monday: Subtraction Facts — From 10
1
Subtraction is the Opposite
1.
3+7=10, 10-3=7, 10-7=3
2
Subtract from 10
1.
7
2.
3
3.
4
4.
6
5.
1
6.
5
3
Estimate First
1.
Circle About 1 (closest to actual), actual=2
2.
Circle About 8, actual=8
4
Use Addition to Help
1.
5+5=10, 10-5=5
2.
4+6=10, 10-4=6
3.
8+2=10, 10-8=2
5
Missing Numbers
1.
10
2.
6
3.
10
4.
1
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Tuesday: Subtracting 11-20
1
Review Subtract from 10
1.
6
2.
3
3.
8
4.
5
5.
2
6.
7
2
Strategy: Make 10 First
1.
13-3=10, 10-2=8
3
Practice Problems
1.
8
2.
8
3.
8
4.
8
5.
8
6.
8
4
Show Two Ways
1.
15-5=10, 10-2=8 OR 7+8=15
2.
17-7=10, 10-2=8 OR 9+8=17
5
Explain Thinking
1.
Accept any valid strategy explanation
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Wednesday: Mixed Subtraction Practice
1
Quick Review
1.
5
2.
2
3.
7
4.
3
5.
6
6.
1
2
Subtract from 11-20
1.
7
2.
7
3.
7
4.
7
5.
7
6.
7
3
Number Talk
1.
15-3 is larger (subtracting less)
2.
18-9 is larger (starting with more)
4
Word Problems
1.
15-7=8
2.
18-9=9
5
Challenge
1.
7
2.
7
3.
Accept any valid student word problem
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Thursday: Fact Families
1
What is a Fact Family?
1.
3+7=10, 7+3=10, 10-3=7, 10-7=3
2
Complete Fact Families
1.
4+6=10, 6+4=10, 10-4=6, 10-6=4
2.
5+5=10, 10-5=5
3.
3+8=11, 8+3=11, 11-3=8, 11-8=3
3
Related Subtraction
1.
11-5=6, 11-6=5
2.
15-7=8, 15-8=7
3.
13-4=9, 13-9=4
4
Missing Numbers
1.
5
2.
9
3.
12
5
Create Your Own
1.
Accept any valid fact family
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Friday: Week 5 Review & Self-Check
1
Subtract from 10
1.
6
2.
3
3.
8
4.
5
5.
2
6.
7
2
Subtract from 11-20
1.
8
2.
8
3.
8
4.
8
5.
8
6.
8
3
Solve Any Way
1.
7
2.
7
3.
7
4.
7
5.
7
6.
7
4
Word Problems
1.
17-8=9
2.
19-12=7
5
Self-Check
1.
Accept student self-assessment and reflection