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Elementary School: 3rd, 4th & 5th Grade
Math
Mental Methods For Multiplication
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Q.1
Which calculation 'family' would be most appropriate to describe 15 cakes?
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3 x 4 = 12 4 x 3 = 12 3 + 3 + 3 + 3 = 12 4 + 4 + 4 = 12
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3 x 5 = 15 5 x 3 = 15 3 + 3 + 3 + 3 + 3 = 15 5 + 5 + 5 = 15
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5 x 4 = 20 4 x 5 = 20 4 + 4 + 4 + 4 = 20 5 + 5 + 5 + 5 = 20
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6 x 4 = 24 4 x 6 = 24 4 + 4 + 4 + 4 + 4 + 4 = 24 6 + 6 + 6 + 6 = 24
Q.2
What are three lots of four?
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4 + 3 = 12
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3 + 3 = 12
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3 x 4 = 12
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3 x 3 = 12
Q.3
2 x 3 = 6 so:
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3 x 3 = 6
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2 + 3 = 6
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3 + 2 = 6
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3 x 2 = 6
Q.4
Which of the following calculations is correct?
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4 x 4 = 16
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4 + 4 + 4 = 16
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3 = 4 = 16
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4 + 4 + 4 + 4 + 4 = 16
Q.5
Jane makes rows of candies. She puts 5 candies in each row. If she makes 4 rows, how many candies will she use?
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45 because 4 x 5 = 45
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54 because 5 x 4 = 54
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25 because 5 x 5 = 25
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20 because 5 x 4 or 4 x 5 = 20
Q.6
If 2 hands = 10 fingers, how many fingers will 6 hands be?
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30 because 6 x 10 = 30
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30 because 3 x 10 = 30
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30 because 6 x 2 = 30
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30 because 2 x 6 = 30
Q.7
2 + 2 + 2 + 2 is the same as:
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4 x 4
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2 x 2
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4 x 2
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2 x 2 x 2 x 2
Q.8
Pizzas are cut into 8 slices. Which calculations show how many slices there would be if there were 3 pizzas?
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3 x 8 = 24 8 x 3 = 24 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 = 24 8 + 8 + 8 = 24
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2 x 4 = 8 4 x 2 = 8 4 + 4 = 8 2 + 2 + 2 + 2 = 8
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2 x 8 = 16 8 x 2 = 16 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 = 16 8 + 8 = 16
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4 x 8 = 32 8 x 4 = 32 8 + 8 + 8 + 8 = 32 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 32
Q.9
Which of the following calculations is incorrect?
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2 x 6 = 12
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6 x 2 = 12
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2 + 2 + 2 + 2 + 2 + 2 = 12
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4 x 4 = 12
Q.10
Which of the following calculations is correct?
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4 x 3 = 12
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3 x 3 = 12
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2 x 4 = 12
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4 x 4 x 4 = 12
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