This Grade 4 worksheet introduces decimal addition and subtraction with tenths. Students practice problems like 0.3 + 0.4 = 0.7 and 0.8 - 0.5 = 0.3, focusing on aligning the decimal points and using place value language. Spot-the-error questions, fill-in-the-blank items, and short answers reinforce that tenths must be added to tenths, building a strong Grade 4 foundation for working with decimals.
Style:
Decimal Addition and Subtraction
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
0.3 + 0.4 = 0.34
Rewrite: 0.3 + 0.4 = 0.7
2. Fix the sentence:
0.8 - 0.5 = 0.5
Rewrite: 0.8 - 0.5 = 0.3
3. Fix the sentence:
0.6 + 0.2 = 0.62
Rewrite: 0.6 + 0.2 = 0.8
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Add the tenths: 0.5 + 0.4 = 0.9
2. Subtract: 0.7 - 0.3 = 0.4
3. 0.2 + 0.6 = 0.8
4. 0.9 - 0.4 = 0.5
Part C: Short Answer
Answer each question in one or two complete sentences.
1. Why must you align the decimal points before adding 0.3 + 0.4?
Aligning decimal points keeps tenths under tenths and ones under ones. For 0.3 + 0.4, lining them up shows 3 tenths plus 4 tenths equals 7 tenths, so the answer is 0.7.
2. Explain how 0.8 - 0.5 = 0.3 using tenths.
The number 0.8 means 8 tenths and 0.5 means 5 tenths. Subtracting 5 tenths from 8 tenths leaves 3 tenths, which is written as 0.3.
Decimal Addition and Subtraction
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
0.3 + 0.4 = 0.34
Rewrite: 0.3 + 0.4 = 0.7
2) Fix the sentence:
0.8 - 0.5 = 0.5
Rewrite: 0.8 - 0.5 = 0.3
3) Fix the sentence:
0.6 + 0.2 = 0.62
Rewrite: 0.6 + 0.2 = 0.8
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) Add the tenths: 0.5 + 0.4 = 0.9
2) Subtract: 0.7 - 0.3 = 0.4
3) 0.2 + 0.6 = 0.8
4) 0.9 - 0.4 = 0.5
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) Why must you align the decimal points before adding 0.3 + 0.4?
Aligning decimal points keeps tenths under tenths and ones under ones. For 0.3 + 0.4, lining them up shows 3 tenths plus 4 tenths equals 7 tenths, so the answer is 0.7.
2) Explain how 0.8 - 0.5 = 0.3 using tenths.
The number 0.8 means 8 tenths and 0.5 means 5 tenths. Subtracting 5 tenths from 8 tenths leaves 3 tenths, which is written as 0.3.
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9 Questions
15-20 minutes
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