Addition Within 10 — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Jess has 5 grapes and gets 5 more. How many grapes does she have now?
A) 9
B) 8
C) 10
D) 7
Tom ends with 10 stickers after getting 3 more. Since 7 + 3 = 10, he started with 7.
2. There are 7 ants on a leaf. Then 2 more crawl on. How many ants are there?
A) 10
B) 9
C) 8
D) 7
4 + 2 = 6 because counting 2 more from 4 gives you 6.
3. A box holds 3 crayons. Tom puts in 4 more. How many crayons are in the box?
A) 8
B) 6
C) 5
D) 7
6 + 3 = 9, not 10. The other choices all add up to 10, but this one does not.
4. Lucy sees 6 fish. Then she sees 1 more. How many fish does Lucy see?
A) 8
B) 7
C) 6
D) 9
The bird had 1 egg and laid 8 more. 1 + 8 = 9 eggs in the nest.
Part B: Fill in the Blank
Write the correct answer on each line.
1. 8 + 2 = 10
Think: what number plus 9 makes 10? Since 1 + 9 = 10, the missing number is 1.
2. 6 + 4 = 10
Think: 5 plus what number makes 7? Count up from 5 to 7 and you count 2 more.
3. 3 + 6 = 9
Think: what number plus 4 makes 8? Since 4 + 4 = 8, the missing number is 4.
4. Ben has 4 apples and finds 3 more. He has 7 apples now.
Think: 3 plus what number makes 9? Count up from 3 to 9 and you count 6 more.
5. There are 1 big duck and 5 small ducks. There are 6 ducks.
Think: what number plus 2 makes 10? Since 8 + 2 = 10, the missing number is 8.