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Question 103

Both 4.8 and 2.7 round up to give the estimate 5 + 3 = 8. Where is the exact sum compared with 8?

  1. It is lower than 8Correct answer
  2. It equals 8
  3. It is greater than 8
  4. Its direction cannot be known

Explanation

The exact sum is 4.8 + 2.7 = 7.5, so it is lower than 8. Because both addends were rounded upward, their rounded sum must be above the true sum; claiming equality ignores the discarded tenths.

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Question 103: Both 4.8 and 2.7 round up to give the estimate 5 + 3 = 8.… · Decimals and Place Value · Questena