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The Subtracting decimals exercise appears under the 5th grade (U.S.) Math Mission, 6th grade (U.S.) Math Mission, Arithmetic essentials Math Mission and Pre-algebra Math Mission. This exercise practices subtracting decimal numbers.

Types of Problems

There is one type of problem in this exercise:

  1. Subtract the numbers: This problem has a subtraction problem about the difference of two decimal numbers. The student is asked to find the correct answer and put it in the slot.
    Sub-dec

    Subtract the numbers

Strategies

This exercise is easy to get accuracy badges and speed badges because there is only one type of problem and it can be done very quickly.

  1. Using a calculator goes against the spirit of the problem, but can increase speed.
  2. Borrowing is necessary on most of these problems.
  3. Subtracting using a distance model can increase speed over the standard algorithms.
  4. These problems specifically have both decimal numbers using the tenths, hundredths, or both.

Real-life Applications

  1. Decimals appear in every-day media to display information to consumers.
  2. Decimals are very common in shopping. Price tags, food labels, and receipts all contain decimals.
  3. At gas pumps, decimals are used to show how much gas is pumped and much it costs per gallon.

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