Gomath 3.8 and 3.9 Review

Estimate:

9.84 + 21.52

Find the sum.

42.19 + 8.8

• 5.107

• 5.099

• 51.07

• 50.99

Find the sum:

9.6+5.49

Find the sum:

9.17 + 5.67

Find the difference:

0.70-0.43

• 27

• 0.27

• 0.33

• 3.3

Find the difference:

4.03-2.25

Find the difference:

15.8-9.67

How do we check our answer when subtracting?

• You subtract two times.

• Add the sum to the number you subtracted. If the difference matches the number you added from your answer is correct.

• Add the difference to the number you subtracted. If the sum matches the number you subtracted from, your answer is correct.

• Subtract the sum to the number you added. If the difference matches the number you added, your answer is correct.

Use rounding to estimate: (remember to round to the nearest whole number)

7.41-3.88