Adding and subtracting numbeDecimals.ppt
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The document provides instructions on how to add and subtract decimals, emphasizing the importance of aligning decimal points. It includes examples of both addition and subtraction, illustrating the process of adding zeros to line up numbers. The fundamental method involves starting from the right and working left while keeping the decimal intact in the answer.
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Adding and subtracting numbeDecimals.ppt
- 2. Essential Question: • How do I add and subtract decimals? • Always line up decimals • Add and subtract like you always do • Bring decimal straight down in your answers
- 3. Adding Examples: 4.55 + 11.3 Put the first number on the top of the second number and line up the decimals. 4.55 + 11.3 You can add a zero to help keep everything lined up 0 15.85 When adding or subtracting you always start from the right and work left.
- 4. 6.44 + 16 When there is not a decimal put one behind the number. Line up the decimal 6.44 + 16. Add a zero to line up everythin g 22.44 00
- 5. Subtracting Examples: 5.34 -2.08 Put the first number on the top of the second number and line up the decimals. 5.34 -2.08 3.26 Different signs Take difference
- 6. 28 – 15.911 When there is not a decimal put one behind the number. 28. -15.9 1 1 Add zeros to line up everything, then subtract 000 7 9 9 8 0 . 2 1 9