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# Adding and Subtracting Decimals Study Guide (page 3)

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## 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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