Addition and Subtraction Quiz

What is the result of adding 12 and 8 using the concept of friendly tens?

• 30

• 22

• 20

• 18

When using the algorithm method, what is the sum of 13, 21, and 15?

• 55

• 49

• 45

• 39

How do you calculate 58 - 9 using mental math?

• Subtract 10 and add 1

• Subtract 8 and then 1

• Subtract 9 directly

• Subtract 5 and then 4

What is the result of 58 - 24 using the algorithm method?

• 34

• 36

• 38

• 32

What is the first step in using the algorithm method for subtraction?

• Subtract the ones place first

• Subtract the tens place first

• Align the numbers by their place values

• Estimate the result