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Making decimal calculations easier

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Concept 1 of 3 · no score 🙂

Use the place value

There is an easier sum hiding insideuse place value0.06 × 3500= 6 × 3500 ÷ 100= 6 × 35 = 210swap for a round number8.2 × 9= 8.2 × 10 − 8.2= 82 − 8.2 = 73.8shrink the divisor12.56 ÷ 40= 1.256 ÷ 4= 0.314× and ÷ can be done in any order — so do the easy one first
Multiplying by 10 is easy, so make × 9 into × 10 − 1.
  1. 10.06 = 6 ÷ 100, so 0.06 × 3500 = 6 × 3500 ÷ 100.