When adding or subtracting decimals, it's important to align the decimal points before you perform the operation. Let's go through the steps for both addition and subtraction of decimals.

**Step 1:** Line up the numbers by the decimal point.

**Step 2:** Add the numbers as if they were whole numbers.

**Step 3:** Place the decimal point in the answer directly below the decimal points in the numbers being added.

For example:

25.7 + 12.34 ------- 38.04

**Step 1:** Line up the numbers by the decimal point.

**Step 2:** Subtract the numbers as if they were whole numbers.

**Step 3:** Place the decimal point in the answer directly below the decimal points in the numbers being subtracted.

For example:

37.6 - 9.82 ------- 27.78

Remember, when subtracting, if the top number is smaller than the bottom number, you may need to borrow from the next place value to the left.

Practice these steps with various examples to become comfortable with adding and subtracting decimals. Good luck!

.Study GuideAdd/Subtract Decimals Worksheet/Answer key

Add/Subtract Decimals Worksheet/Answer key

Add/Subtract Decimals Worksheet/Answer key

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Add/Subtract Decimals

Number and Operations (NCTM)

Understand numbers, ways of representing numbers, relationships among numbers, and number systems.

Develop understanding of fractions as parts of unit wholes, as parts of a collection, as locations on number lines, and as divisions of whole numbers.

Compute fluently and make reasonable estimates.

Use visual models, benchmarks, and equivalent forms to add and subtract commonly used fractions and decimals.

Algebra (NCTM)

Use mathematical models to represent and understand quantitative relationships.

Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.