Question

Match the following statements on the left with their correct results on the right:

• A. 70
• B. 60
• C. 50
• D. 80

Answer 1

30 + 30 + 10 can be solved as follows:

30 = 3 tens + 0 ones
+ +
30 = 3 tens + 0 ones
+ +
10 = 1 ten + 0 ones
___________
= 7 tens = 70......(1)

30 + 20 + 10 can be solved as follows:

30 = 3 tens + 0 ones
+ +
20 = 2 tens + 0 ones
+ +
10 = 1 ten + 0 ones
___________
= 6 tens = 60......(2)

10 + 20 + 20 can be solved as follows:

10 = 1 ten + 0 ones
+ +
20 = 2 tens + 0 ones
+ +
20 = 2 tens + 0 ones
___________
= 5 tens = 50......(3)

20 + 30 + 30 can be solved as follows:

20 = 2 tens + 0 ones
+ +
30 = 3 tens + 0 ones
+ +
30 = 3 tens + 0 ones
___________
= 8 tens = 80......(1)