Lesson: Relating Addition to Subtraction: Numbers up to 1000 Elementary School • Mathematics • 3rd Grade

Mathematics

In this lesson, we will learn how to use the relationship between addition and subtraction to check answers to problems with numbers up to 1000.

Worksheet

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.

Q2:

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

What is the missing number?

Q3:

Knowing that , find without any calculations.

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