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031_G1U20_G1U21˙—» ¿º 2011.3.22 4:23 PM ˘ ` 37 PDF_In 2540DPI 150LPI T
Activity 2 Numbers with Same Sums
1 Make a number in different ways. What you need:
Number Cards (B4)
Let’s Play
1. Choose a number from 11 to 20.
2. Pick 2 number cards that make the number
you chose.
3. Make different addition sentences with the
same sum.
0 1 2 3 4 5 6 7 8 9 1011121314151617181920
For example,
addition sentences that make
11 are
11= 1 + 10 = 2 + 9 = 3 + 8
= + = 2+ 9= 3+ 8
=4+ 7= 5+ 6= +
20. Make Numbers 37
Activity 2 Numbers with Same Sums
1 Make a number in different ways. What you need:
Number Cards (B4)
Let’s Play
1. Choose a number from 11 to 20.
2. Pick 2 number cards that make the number
you chose.
3. Make different addition sentences with the
same sum.
0 1 2 3 4 5 6 7 8 9 1011121314151617181920
For example,
addition sentences that make
11 are
11= 1 + 10 = 2 + 9 = 3 + 8
= + = 2+ 9= 3+ 8
=4+ 7= 5+ 6= +
20. Make Numbers 37
