Problem 3 · 2017 Math Kangaroo
Easy
Arithmetic & Operations
Which number has to be subtracted from −17 in order to obtain −33?
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Answer: C — 16
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Hint 1 of 2
Write it as an equation: −17 minus the unknown equals −33.
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Hint 2 of 2
Solve for the unknown by comparing the two numbers.
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Approach: set up and solve a simple equation
- We need −17 − x = −33.
- Rearranging, x = −17 − (−33) = −17 + 33 = 16.
- So the number subtracted is 16.
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