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Question (11)

QN0032705

Using the doubling and halving strategy, 15 × 22 can first be changed to

(A) 30 × 11
(B) 10 × 33
(C) 45 × 7
(D) 5 × 66

Correct Answer: A

Explanation:

Double 15 and half 22 to get 30 × 11. The product remains the same.

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Question (12)

QN0032706

Find the value of 12 × 45 using doubling and halving.

(A) 520
(B) 530
(C) 540
(D) 560

Correct Answer: C

Explanation:

12 × 45 = 6 × 90 = 540.

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Question (13)

QN0032707

Which multiplication is least suitable for using the doubling and halving strategy?

(A) 25 × 16
(B) 5 × 38
(C) 50 × 14
(D) 17 × 19

Correct Answer: D

Explanation:

The strategy is most useful when one factor is 5, 25, or 50.

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Question (14)

QN0032708

What is the product of 16 × 45?

(A) 700
(B) 710
(C) 720
(D) 740

Correct Answer: C

Explanation:

16 × 45 = 8 × 90 = 720.

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Question (15)

QN0032709

Which expression has the same value as 25 × 24 after one step of doubling and halving?

(A) 50 × 12
(B) 20 × 30
(C) 75 × 8
(D) 12 × 50

Correct Answer: A

Explanation:

Double 25 and half 24 to get 50 × 12.

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Question (16)

QN0032710

Find the value of 5 × 46.

(A) 220
(B) 225
(C) 230
(D) 235

Correct Answer: C

Explanation:

5 × 46 = 10 × 23 = 230.

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Question (17)

QN0032711

Which pair is obtained after halving the first factor and doubling the second factor in 14 × 20?

(A) 7 × 40
(B) 28 × 10
(C) 10 × 28
(D) 35 × 8

Correct Answer: A

Explanation:

Half of 14 is 7 and double of 20 is 40.

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Question (18)

QN0032712

What is 50 × 36?

(A) 1,600
(B) 1,700
(C) 1,800
(D) 1,900

Correct Answer: C

Explanation:

50 × 36 = 25 × 72 = 1,800.

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Question (19)

QN0032713

A fruit seller packs 25 apples in each box. If there are 32 boxes, how many apples are there altogether?

(A) 700
(B) 750
(C) 800
(D) 850

Correct Answer: C

Explanation:

25 × 32 = 50 × 16 = 100 × 8 = 800.

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Question (20)

QN0032714

Which statement best describes the doubling and halving strategy?

(A) Double both factors to get the same product.
(B) Half both factors to get the same product.
(C) Double one factor and half the other to keep the product unchanged.
(D) Add both factors before multiplying.

Correct Answer: C

Explanation:

Doubling one factor and halving the other keeps the product unchanged.

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Question (11)

Using the doubling and halving strategy, 15 × 22 can first be changed to

Explanation:

Link:

Question (12)

Find the value of 12 × 45 using doubling and halving.

Explanation:

Link:

Question (13)

Which multiplication is least suitable for using the doubling and halving strategy?

Explanation:

Link:

Question (14)

What is the product of 16 × 45?

Explanation:

Link:

Question (15)

Which expression has the same value as 25 × 24 after one step of doubling and halving?

Explanation:

Link:

Question (16)

Find the value of 5 × 46.

Explanation:

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Question (17)

Which pair is obtained after halving the first factor and doubling the second factor in 14 × 20?

Explanation:

Link:

Question (18)

What is 50 × 36?

Explanation:

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Question (19)

A fruit seller packs 25 apples in each box. If there are 32 boxes, how many apples are there altogether?

Explanation:

Link:

Question (20)

Which statement best describes the doubling and halving strategy?

Explanation:

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