Problem 1 · 2020 Math Kangaroo
Medium
Arithmetic & Operations
order-of-operations
When the results of the following additions are written in descending order, what sum will be in the middle?
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Answer: C — 1 + 23 + 45
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Hint 1 of 2
Each option glues some digits together before adding — work out the five totals first.
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Hint 2 of 2
Once you have the five sums, you only need the one that lands in the middle when ordered.
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Approach: evaluate each sum, then find the median of the five values
- The five totals are 348, 60, 69, 51 and 240.
- Put them in descending order: 348, 240, 69, 60, 51.
- The middle (third) value is 69, which comes from choice C.
Mark:
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