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Problem #67 · October 2, 2026

Natural numbers

What number does the sum 3⋅1000+0⋅100+5⋅10+83\cdot1000 + 0\cdot100 + 5\cdot10 + 8 represent?
  1. A358358
  2. B30853085
  3. C35083508
  4. D30583058
  5. E35803580

WORKED EXAMPLE

Solution

We calculate each addend: 3⋅1000=30003\cdot1000 = 3000, 0⋅100=00\cdot100 = 0, 5⋅10=505\cdot10 = 50, and 88. We add them: 3000+0+50+8=30583000 + 0 + 50 + 8 = 3058. It is important not to forget that 00 stands in the hundreds place.
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