Addition Within 10 — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Sam has 3 red balls and 6 blue balls. How many balls does Sam have in all?
A) 8
B) 9
C) 7
D) 10
Sam has 9 balls in all. Joining 3 red balls with 6 blue balls gives 3 + 6 = 9.
2. There are 4 birds on a branch. Then 4 more land on it. How many birds are there now?
A) 7
B) 6
C) 9
D) 8
There are 8 birds now. The 4 birds already there plus 4 more that land make 4 + 4 = 8.
3. Mia picks 2 daisies and 5 roses. How many flowers does she have altogether?
A) 8
B) 6
C) 7
D) 9
Mia has 7 flowers altogether. 2 daisies and 5 roses combine to make 2 + 5 = 7.
4. A pond has 1 frog. Then 8 more frogs jump in. How many frogs are in the pond?
A) 10
B) 8
C) 9
D) 7
There are 9 frogs in the pond. The 1 frog already there plus 8 more that jump in make 1 + 8 = 9.
Part B: Fill in the Blank
Write the correct answer on each line.
1. 4 + 5 = 9
Counting on from 4 by 5 more lands on 9, so 4 + 5 = 9.
2. 3 + 7 = 10
Since 3 + 7 = 10, the missing number is 3.
3. 6 + 2 = 8
Since 6 + 2 = 8, the missing number is 2.
4. There are 5 cats and 4 dogs. There are 9 pets in all.
5 cats joined with 4 dogs makes 5 + 4 = 9 pets in all.
5. I see 2 stars and 7 moons. I see 9 things in the sky.
Adding 2 stars and 7 moons gives 2 + 7 = 9 things in the sky.