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Published byJulius Gregory Modified over 7 years ago

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Adding and Subtracting Decimals

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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

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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.

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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 0

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-8.33 + -10.972 -8.33 -10.972 Same signs Add – keep the sign Add a zero to line up everythin g 0 Line up the decimal -19.302 +

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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

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-38.59 – (-7.81) -38.59 + 7.81 Subtract to add when negatives are used. Different signs take difference Line up the decimal -30.78 +

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28 – 15.911 When there is not a decimal put one behind the number. 28. -15.911 Add zeros to line up everything, then subtract 000 799 80. 219

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0.57 4.625 8.75 Magic Square 6.3750.57 5.254.6254 2.258.752.875 The sum of each row, column, and diagonal must be the same. Sums to 13.875

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