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Decimal Addition and Subtraction

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Decimal Addition and Subtraction worksheet preview

Decimal Addition and Subtraction

Decimal blocks and number line illustration

🎯 Part 1: Estimating and Models

I can estimate sums and differences of decimals to the hundredths.

1. Estimate the sum by rounding to the nearest whole number: 3.47 + 2.83

My estimate: _____ + _____ = _____

2. Estimate the difference: 8.92 - 4.15

My estimate: _____ - _____ = _____

3. Sarah has $12.75. She wants to buy a book for $8.49. About how much money will she have left?

About $3

About $4

About $5

About $6

4. Use the decimal grid model to solve: 0.35 + 0.28. Draw or describe your model:

✏️ Part 2: Partial Sum and Difference Strategies

I can use partial sum and partial difference strategies to add and subtract decimals.

5. Use the partial sum strategy to solve 4.67 + 3.25. Break apart the numbers:

4.67 = _____ + _____ + _____

3.25 = _____ + _____ + _____

Add the parts: _____ + _____ + _____ = _____

6. Use the partial difference strategy to solve 7.84 - 2.37:

7.84 - 2.00 = _____

_____ - 0.30 = _____

_____ - 0.07 = _____

🔢 Part 3: Traditional Algorithm

I can use the traditional method to add and subtract decimals to the hundredths.

7. Solve using the traditional algorithm. Remember to line up the decimal points:

15.73

+ 8.49

_______

8. Solve using the traditional algorithm:

12.05

- 7.38

_______

9. Extension Challenge: A recipe calls for 2.75 cups of flour, 1.5 cups of sugar, and 0.25 cups of salt. How many total cups of dry ingredients are needed?

Show your work using any strategy:

10. Check your answer from question 9 by estimating. Does your exact answer make sense?

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