Grade 4 students practice vertical alignment when adding decimals with different numbers of decimal places. They learn to stack decimals carefully so tenths align with tenths and hundredths align with hundredths. Annexing zeros to fill empty places helps students add column by column without place-value confusion in this CCSS 4.NF.5 practice. Students align decimal points carefully and master adding values with different place-value lengths in real-world Grade 4 contexts.
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:
To add 3.45 + 12.6 in Grade 4, you write 3.45 above 12.6 and align the rightmost digits before adding.
Rewrite: To add 3.45 + 12.6 in Grade 4, you align the decimal points and write 12.6 as 12.60 before adding.
2. Fix the sentence:
When a Grade 4 student adds 5.7 and 2.34, the sum is wrote as 7.04 because 7 plus 34 equals 41.
Rewrite: When a Grade 4 student adds 5.7 and 2.34, the sum is written as 8.04 because 5.70 plus 2.34 equals 8.04.
3. Fix the sentence:
In Grade 4, the sum of 0.6 plus 0.45 equal 0.51 when you simply joins the digits together.
Rewrite: In Grade 4, the sum of 0.6 plus 0.45 equals 1.05 when you align decimal points and add carefully.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Grade 4: To add 3.45 + 12.6, rewrite 12.6 as 12.60 so the hundredths place is filled.
2. Grade 4: When stacking 7.8 + 2.35, place the decimal point directly under the other decimal point.
3. Grade 4: The sum 4.27 + 1.5 equals 5.77 after aligning and annexing a zero.
4. Grade 4: Adding 0.9 + 0.08 gives 0.98 because tenths and hundredths must be aligned.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. Grade 4: Explain why you must annex a zero when adding 6.4 + 3.27.
You annex a zero so 6.4 becomes 6.40, which gives the same value but fills the hundredths place. This lets you add column by column without confusing tenths and hundredths.
2. Grade 4: Describe the steps to add 9.6 + 4.85 vertically.
First write 9.6 as 9.60. Stack 9.60 above 4.85 with decimal points aligned. Add hundredths: 0+5=5. Add tenths: 6+8=14, write 4 carry 1. Add ones: 9+4+1=14. The sum is 14.45.
Decimal Addition and Subtraction
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
To add 3.45 + 12.6 in Grade 4, you write 3.45 above 12.6 and align the rightmost digits before adding.
Rewrite: To add 3.45 + 12.6 in Grade 4, you align the decimal points and write 12.6 as 12.60 before adding.
2) Fix the sentence:
When a Grade 4 student adds 5.7 and 2.34, the sum is wrote as 7.04 because 7 plus 34 equals 41.
Rewrite: When a Grade 4 student adds 5.7 and 2.34, the sum is written as 8.04 because 5.70 plus 2.34 equals 8.04.
3) Fix the sentence:
In Grade 4, the sum of 0.6 plus 0.45 equal 0.51 when you simply joins the digits together.
Rewrite: In Grade 4, the sum of 0.6 plus 0.45 equals 1.05 when you align decimal points and add carefully.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) Grade 4: To add 3.45 + 12.6, rewrite 12.6 as 12.60 so the hundredths place is filled.
2) Grade 4: When stacking 7.8 + 2.35, place the decimal point directly under the other decimal point.
3) Grade 4: The sum 4.27 + 1.5 equals 5.77 after aligning and annexing a zero.
4) Grade 4: Adding 0.9 + 0.08 gives 0.98 because tenths and hundredths must be aligned.
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) Grade 4: Explain why you must annex a zero when adding 6.4 + 3.27.
You annex a zero so 6.4 becomes 6.40, which gives the same value but fills the hundredths place. This lets you add column by column without confusing tenths and hundredths.
2) Grade 4: Describe the steps to add 9.6 + 4.85 vertically.
First write 9.6 as 9.60. Stack 9.60 above 4.85 with decimal points aligned. Add hundredths: 0+5=5. Add tenths: 6+8=14, write 4 carry 1. Add ones: 9+4+1=14. The sum is 14.45.
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