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Decimal Addition and Subtraction
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Decimal Addition and Subtraction
📚 Part 1: Decimal Addition Using Partial Sums
1. Add 3.45 + 2.36 using partial sums. Show your work by breaking down each decimal into place values.
2. Solve 5.78 + 1.94 using the partial sums method. Write out each step clearly.
3. A student bought a notebook for $4.75 and a pen for $2.48. What is the total cost? Use partial sums to solve.
4. Which partial sum is correct for adding 6.23 + 3.57?
6 + 3 = 9, 0.2 + 0.5 = 0.7, 0.03 + 0.07 = 0.10
6 + 3 = 9, 0.23 + 0.57 = 0.80
6.23 + 3.57 = 9.80
✏️ Part 2: Decimal Subtraction Using Partial Differences
5. Subtract 5.63 - 2.47 using partial differences. Show each place value step.
6. Find the difference: 8.92 - 3.68. Use the partial differences method.
7. Sarah had $12.75. She spent $8.49 on lunch. How much money does she have left? Solve using partial differences.
8. True or False: When using partial differences for 7.84 - 2.59, one step would be 0.04 - 0.09.
True
False
🎯 Part 3: Mixed Practice and Reflection
9. Choose the correct method and solve: 9.45 + 6.78
10. Choose the correct method and solve: 15.82 - 7.96
11. Write an "I can..." statement about what you learned in this lesson:
I can ________________________________________________
12. Extension Challenge: Create your own word problem that requires adding or subtracting decimals, then solve it using partial sums or partial differences.
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