Adding Three Numbers — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. For 2 + 8 + 3, which two make 10 first?
A) 2 and 8
B) 2 and 3
C) 8 and 3
D) none
2+8=10, so add 3 to get 13.
2. For 6 + 4 + 5, which two make 10 first?
A) 6 and 5
B) 4 and 5
C) 6 and 4
D) none
6+4=10, then 10+5=15.
3. For 7 + 3 + 9, which two make 10 first?
A) 7 and 9
B) 3 and 9
C) 7 and 3
D) all pairs
7+3=10, then 10+9=19.
4. For 1 + 9 + 4, which two make 10 first?
A) 1 and 4
B) 9 and 4
C) 1 and 9
D) none
1+9=10, then 10+4=14.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Sam has 3 red, 7 blue, 5 green marbles. Total = 15
10+5=15 marbles.
2. Ana reads 2, 8, and 4 pages. Total = 14
10+4=14 pages.
3. A box has 6 + 4 + 9 crayons = 19
10+9=19 crayons.
4. Leo scores 5 + 5 + 6 points = 16
10+6=16 points.
5. A tray holds 1 + 9 + 7 cookies = 17
10+7=17 cookies.