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.
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 287+254=541, find 541−254 without any calculations.
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