1. Adding and Subtracting Decimals Textbook page 102

2. How do I add or subtract decimals? You can add or subtract decimals the same way you would whole numbers – only you must line up the decimals!

3. Example 1: Adding Decimals 9.8 + 9.7 + 9.425 + 9.85 9.800* line up 9.700 decimals 9.425* use zeros as +9.850 placeholders 38.775ADD, remembering the decimal

4. Example 2: Subtracting Decimals 10 – 9.85 * line up decimals 10.00* use zeros as - 9.85 placeholders 0.15SUBTRACT, remembering the decimal

5. Example 3: Evaluate 7.52 – s for each value of s. (A) s = 2.9 7.52 – 2.9* line up 7.52 decimals - 2.90* use zeros as 4.62 placeholders (B) s = 4.5367 7.52 – 4.5367* line up 7.5200 decimals - 4.5367* use zeros as 2.9833 placeholders