Inverse Operations – Addition & Subtraction (Ex. 2)

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1. Question 1

   Multiple choice

   To check 830,000 - 170,000 = 660,000, you would do:

2. Question 2

   Multiple choice

   What is the inverse of subtracting 45,000?

3. Question 3

   Multiple choice

   456,789 + 234,567 = 691,356. How do you check this?

4. Question 4

   Sequence

   What is the missing number in the sequence? 900,000 ; 800,000 ; 700,000 ; ___ ; 500,000

5. Question 5

   True or false

   Addition and subtraction are inverse operations.

More exercises in this module

• Efficient Calculation Strategies (Ex. 1)

• Efficient Calculation Strategies (Ex. 3)

• Adding Large Numbers (Ex. 3)

• Estimating with Rounding (Ex. 3)

• Six-Digit Addition (Ex. 6)

• Subtracting Large Numbers (Ex. 3)