Inverse Operations to Check Answers (Ex. 1)

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1. Question 1

   Multiple choice

   If 3,245 + 2,167 = 5,412, which check can you use?

2. Question 2

   Multiple choice

   If 7,560 − 3,210 = 4,350, which check proves it?

3. Question 3

   Multiple choice

   A student calculates 4,832 + 2,591 = 7,423. Which check shows an error?

4. Question 4

   Sequence

   3,000 + 2,000 = 5,000 → check: 5,000 − 2,000 = ___.

5. Question 5

   True or false

   The inverse of addition is subtraction.

More exercises in this module

• Column Addition with Regrouping (Ex. 1)

• Estimating with Rounding (Ex. 2)

• Four-Digit Subtraction (Ex. 3)

• Estimating with Rounding (Ex. 3)

• Four-Digit Addition (Ex. 1)

• Inverse Operations to Check Answers (Ex. 3)