In this lesson, we will learn how to use addition to verify the correctness of the result of subtraction.
Q1:
A classroom has 35 students. If 13 of them are boys, how many girls are there?
Pick the equation which can be used to check your answer.
Q2:
If you know that 46−15=31, find the total of 15+31 without calculating.
Q3:
There are 58 trees in the street. 14 trees are being cut down. How many trees will be left in the street?
Hint: After you subtract check your answer by adding. 58−14=14+=58
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