1. Adding and Subtracting Decimals August 20, 2013 Sixth Grade Math

2. Essential Question How do I add and subtract decimals using the standard algorithm for each operation?

3. To add decimals Step 1: Line up the decimal points so that the same place values are lined up. Use zeros as place holders. **When adding a whole number and a decimal, put a decimal point behind the whole number. Step 2: Add from right to left, starting with the smallest place value. Place a decimal point in the answer directly below the other decimal points.

4. Example 1 0.64 + 0.39 Line up the decimal points. 0.64 +0.39 __________________________ Add the columns. 1.03

5. Example 2 5.74 + 3 Line up the decimal points. 5.74 + 3.00 _____________________________ Add the columns. 8.74 Don’t forget to put a decimal point behind the whole number and add zeros to hold the place values. Don’t forget to put a decimal point behind the whole number and add zeros to hold the place values.

6. To subtract decimals Step 1: Line up the decimal points so that the same place values are lined up. Use zeros as place holders. **When subtracting a whole number and a decimal, put a decimal point behind the whole number. Step 2: Subtract from right to left, starting with the smallest place value. Place a decimal point in the answer directly below the other decimal points.

7. Example 1 0.86 – 0.49 Line up the decimal points 0.86 - 0.49 __________________________ Subtract the columns. 7 1 0.37

8. Example 2 36 – 11.89 Line up the decimal points. Don’t forget to put a decimal point behind the whole number and add zeros to hold the place values. Don’t forget to put a decimal point behind the whole number and add zeros to hold the place values. 36.00 - 11.89 Subtract the columns. Regroup if necessary. 59 10 24.11

9. Practice Time