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Question 41

Which calculation does NOT give the same result as 2.8 + 0.35?

  1. 2.80 + 0.35 = 3.15
  2. 2.8 + 0.3 + 0.05 = 3.15
  3. 3 + 0.15 = 3.15
  4. 2.8 + 0.35 = 2.43Correct answer

Explanation

Aligning places gives 2.80 + 0.35 = 3.15, which also equals 2.8 + 0.3 + 0.05 and 3 + 0.15. The calculation 2.8 + 0.35 = 2.43 right-aligns 8 and 5 as though both were hundredths, so it does not preserve place value.

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Question 41: Which calculation does NOT give the same result as 2.8 +… · Decimals and Place Value · Questena