Question

Does the addition problem show a way to add 27 + 38?

Circle Yes or No for each addition problem.
a. 20 + 7 + 30 + 8 Yes No
b. 20 + 70 + 38 yes no
c. 20 + 30 + 7 + 8 Yes No
d. 50 + 10 + 5 yes no

Answer 1

a. yes

b. no

c. yes

d. yes

Explanation:

For a, 27 + 38 can be broken apart. 27 is broken up by adding smaller numbers (20 + 7 = 27) and the same is done with 38 (30 + 8 = 38), so A and C shows a way to add 27 and 38. In C, the numbers are just put into a different order. B is not a way to add 27 and 38, because the sum is different.

27 + 38 = 65, however 20 + 70 + 38 = 128. The addition problem for D is a way to solve for 27 + 38, because it is broken up differently than A and C. They instead added the 20 and 30 together first, then split up 15 (from 8+7) into 10 and 5. So D is a way to solve, because it gets the same answer as 27 and 38 :D