Inverse Operations – Addition & Subtraction (Ex. 1)

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1. Question 1

   Multiple choice

   If 345,000 + 255,000 = 600,000, what is 600,000 - 255,000?

2. Question 2

   Multiple choice

   What is the inverse operation of addition?

3. Question 3

   Multiple choice

   If 890,000 - 340,000 = 550,000, which fact checks this?

4. Question 4

   Sequence

   What is the missing number in the sequence? 600,000 ; 500,000 ; 400,000 ; ___ ; 200,000

5. Question 5

   True or false

   You can check 700,000 + 300,000 = 1,000,000 by doing 1,000,000 - 300,000 and seeing if you get 700,000.

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)