Addition Within 20 — Answer Key
Part A: Trace the Words
Trace each word carefully by following the dotted lines.
1. add
2. sum
3. plus
4. more
5. total
6. equal
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 7 + 6 = 13
Make a ten: 7 + 3 = 10, then 10 + 3 = 13.
2. 5 + 7 = 12
Make a ten: 7 + 3 = 10, then 10 + 2 = 12.
3. 9 + 6 = 15
Make a ten: 9 + 1 = 10, then 10 + 5 = 15.
4. 8 + 8 = 16
8 + 8 = 16. This is a doubles fact: 8 plus 8 equals 16.
Part C: True or False?
Read each statement. Circle True or False.
1. 7 + 8 = 15
True False
True. 7 + 8 does equal 15. You can count on 8 from 7 to check.
2. 6 + 9 = 14
True False
False. 6 + 9 = 15, not 14. Count on 9 from 6 to see.
3. 4 + 7 = 11
True False
True. 4 + 7 does equal 11. You can count on 7 from 4 to check.