Students fix three decimal multiplication errors — decimal point in the wrong position in three different products. Part B has four questions computing decimal products and identifying total decimal places in a multiplication. Part C has two questions about placing the decimal in a product and a unit-price multiplication problem.
Correcting decimal-placement errors in multiplication — where students multiply correctly but miscount decimal places — targets the most common and consequential error in Grade 5 decimal multiplication.
Style:
Decimal Operations: Add, Subtract, Multiply, Divide
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
0.3 × 0.4 = 1.2 because 3 × 4 = 12.
Rewrite: 0.3 × 0.4 = 0.12 because 3 × 4 = 12 and there are two total decimal places in the factors.
2. Fix the sentence:
2.5 × 6 = 1.50 since 25 × 6 = 150 and you move the decimal one place.
Rewrite: 2.5 × 6 = 15.0 since 25 × 6 = 150 and one decimal place gives 15.0.
3. Fix the sentence:
1.2 × 0.5 = 6.0 because 12 × 5 = 60.
Rewrite: 1.2 × 0.5 = 0.60 because 12 × 5 = 60 and two decimal places gives 0.60.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 4.3 × 7 = 30.1
2. 0.6 × 0.8 = 0.48
3. When multiplying 3.2 × 1.4, the product has 2 total decimal places.
4. 5.05 × 4 = 20.20
Part C: Short Answer
Answer each question in one or two complete sentences.
1. How do you decide where to put the decimal point in a multiplication answer?
Count the total decimal places in both factors, then place the decimal that many places from the right in the product.
2. A ribbon costs $3.25 per meter. What is the cost of 3 meters?
3.25 × 3 = 9.75, so 3 meters of ribbon costs $9.75.
Decimal Operations: Add, Subtract, Multiply, Divide
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
0.3 × 0.4 = 1.2 because 3 × 4 = 12.
Rewrite: 0.3 × 0.4 = 0.12 because 3 × 4 = 12 and there are two total decimal places in the factors.
2) Fix the sentence:
2.5 × 6 = 1.50 since 25 × 6 = 150 and you move the decimal one place.
Rewrite: 2.5 × 6 = 15.0 since 25 × 6 = 150 and one decimal place gives 15.0.
3) Fix the sentence:
1.2 × 0.5 = 6.0 because 12 × 5 = 60.
Rewrite: 1.2 × 0.5 = 0.60 because 12 × 5 = 60 and two decimal places gives 0.60.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) 4.3 × 7 = 30.1
2) 0.6 × 0.8 = 0.48
3) When multiplying 3.2 × 1.4, the product has 2 total decimal places.
4) 5.05 × 4 = 20.20
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) How do you decide where to put the decimal point in a multiplication answer?
Count the total decimal places in both factors, then place the decimal that many places from the right in the product.
2) A ribbon costs $3.25 per meter. What is the cost of 3 meters?
3.25 × 3 = 9.75, so 3 meters of ribbon costs $9.75.
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9 Questions
15-20 minutes
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