Grade 3 Math Practice Test: Multiplying by Multiples of 10
- Multiplying by Multiples of 10
- 10 questions
- 12 minutes
These 10 questions practice products like 4 × 30 and 7 × 50. Tip: multiply the basic fact first (4 × 3 = 12), then think of the answer as tens (12 tens = 120).
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
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Question 1
What is 4 × 30?
Correct answer: A
4 × 3 = 12, so 4 × 30 is 12 tens, which is 120. 1,200 adds one zero too many.
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Question 2
What is 7 × 50?
Correct answer: D
7 × 5 = 35, and 35 tens equal 350. The answer 35 forgets that 50 is 5 tens, not 5 ones.
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Question 3
Which expression has the same value as 6 × 40?
Correct answer: D
40 is the same as 4 × 10, so 6 × 40 = 6 × 4 × 10 = 240. 6 × 4 + 10 adds the 10 instead of multiplying by it, which gives only 34.
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Question 4
What number goes in the box?
☐ × 80 = 640
Correct answer: A
8 × 8 = 64, so 8 × 80 = 64 tens = 640. 9 does not work because 9 × 80 = 720.
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Question 5
A store has 9 boxes of glue sticks. Each box holds 20 glue sticks. How many glue sticks does the store have?
Correct answer: B
9 × 2 = 18, so 9 × 20 = 18 tens = 180 glue sticks. 29 comes from adding 9 + 20 instead of multiplying.
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Question 6
What is 5 × 60?
Correct answer: C
5 × 6 = 30, and 30 tens is 300. The fact 5 × 6 already ends in 0, so the product has two zeros. 3,000 has one zero too many.
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Question 7
Which product is greater than 400?
Correct answer: C
6 × 70 = 420, which is greater than 400. 8 × 50 equals exactly 400, so it is not greater; 9 × 40 = 360 and 7 × 50 = 350.
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Question 8
A parking lot has 8 rows. Each row has 30 parking spaces. How many parking spaces are there in all?
Correct answer: B
8 rows of 30 is 8 × 30. Since 8 × 3 = 24, the product is 24 tens = 240. 210 is 7 × 30, one row short.
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Question 9
Owen knows that 4 × 60 is the same as 24 tens. What is 24 tens?
Correct answer: A
24 tens means 24 groups of 10, which is 240. So 4 × 60 = 240. 2,400 would be 24 hundreds.
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Question 10
What number goes in the box?
3 × ☐ = 270
Correct answer: D
3 × 9 = 27, so 3 × 90 = 27 tens = 270. 3 × 9 is only 27 and 3 × 80 is 240.
Questions you leave blank are not counted as wrong.
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