Leah has sold magazine subscriptions worth $330 for a school fundraiser. If she reaches a total of $500, she wins a gift certificate. How many more subscriptions does she need to sell to reach $500?

Question

Scarlet Levy

Mathematics

2 May, 12:15

Leah has sold magazine subscriptions worth $330 for a school fundraiser. If she reaches a total of $500, she wins a gift certificate. How many more subscriptions does she need to sell to reach $500?

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Answers (1)

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Doyle · Answer 1

You can solve by subtracting: 500-330

but I like to use mental math and think this way:

she has 330

70 more will give her 400

and 100 more will give her 500

100 + 70 is 170.