Problem 18 · 2010 Math Kangaroo
Stretch
Arithmetic & Operations
number-systems
The number \(60 \times 60 \times 24 \times 7\) is the same as
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Answer: D — the number of seconds in one week
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Hint 1 of 2
Read the factors as time conversions: 60 seconds, 60 minutes, 24 hours, 7 days.
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Hint 2 of 2
Multiplying them turns seconds all the way up to one week.
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Approach: interpret the product as a chain of time units
- 60 × 60 turns seconds into hours, × 24 turns hours into days, × 7 turns days into a week.
- So 60 × 60 × 24 × 7 is the number of seconds in one week.
- That matches option D.
Mark:
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