Worksheet: Relating Addition to Subtraction: Numbers up to 1000

In this worksheet, we will practice using the relationship between addition and subtraction to check answers to problems with numbers up to 1000.

Q1:

There are 511 pupils in a school. If 366 of them are boys, how many girls are in the school?

Check the number of pupils by adding the number of boys to the number of girls in the school.

  • A145+366=511
  • B155+366=511
  • C245+366=511
  • D55+366=511
  • E255+366=511

Q2:

Subtract the problem shown and then add to check your work.

What is the missing number?

Q3:

Knowing that 287+254=541, find 541254 without any calculations.

Q4:

Perform addition of the problem shown and then subtract to check your work.

What is the missing number?

Q5:

Knowing that 710167=543, find 167+543= without any calculations.

Q6:

The 3 numbers 489, 276, and 213 belong to the following fact family:

276+213=489,
213+276=489,
489213=276,
.

Write the missing number sentence.

  • A489276=213
  • B213489=276
  • C489+213=276
  • D276489=213
  • E489+276=213

Q7:

Add the parts 486+235 to find the missing number. Check your work by subtracting one of the parts from the whole.

Q8:

Subtract 268 from 712 to find the missing part.

Check your answer by adding the parts together.

Q9:

Find the result of 625375 using the number line.

Q10:

Find the result of 750225, using the number line.

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