Arithmetic/A Look Ahead at the Decimal System

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So far, every number we have discussed has been an integer. What if something costs between two and three dollars? This is when decimals are used. A decimal point, which looks like a full stop (or period), separates the integral part of the number from the decimal part. Instead of each number being ten times as large, they become ten times as small.

  • 1.5 : 1 + (5 ÷ 10)
  • 3.85 : 3 + (8 ÷ 10 + 5 ÷ 100)