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Adding and Subtracting Decimals Study Guide (page 3)

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Updated on Oct 4, 2011

Adding and Subtracting Decimals Sample Questions

  1. 12 + 0.1 + 0.02 + 0.943
  2. 78 – 0.78
  3. 12 + 0.1 – 0.02 + 0.943 – 2.3

Solutions to Sample Questions

Question 1

1. Line up the numbers and fill the "holes" with zeros, like this:
2. Move the decimal point down into the answer and add:

Question 2

1. Line up the numbers and fill the "holes" with zeros, like this:
2. Move the decimal point down into the answer and subtract:
3. Check the subtraction by addition:
  It's correct: You got back the other number in the problem.

Question 3

1. Line up the numbers to be added and fill the "holes" with zeros:
2. Move the decimal point down into the answer and add:
3. Line up the numbers to be subtracted and fill the "holes" with zeros:
4. Move the decimal point down into the answer and add:
5. Subtract the sum of step 4 from the sum of step 2, after lining up the decimal points and filling the "holes" with zeros:
6. Check the subtraction by addition: It's correct: You got back the other number in the problem.

Find practice problems and solutions for these concepts at Adding and Subtracting Decimals Practice Questions.

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