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Question (21)

QN0015170

The value of 34 – (9 + 12) is:

(A) 11
(B) 12
(C) 13
(D) 14

Correct Answer: C

Explanation:

34 – 21 = 13.

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Question (22)

QN0015171

Add brackets to make 56 – 14 – 8 equal to 34. Which is correct?

(A) 56 – (14 – 8)
(B) (56 – 14) – 8
(C) 56 – (14 + 8)
(D) (56 + 14) – 8

Correct Answer: B

Explanation:

42 – 8 = 34.

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Question (23)

QN0015172

The value of –22 – (12 + 10) + 22 is:

(A) –22
(B) 0
(C) 22
(D) –44

Correct Answer: A

Explanation:

–22 – 22 + 22 = –22.

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Question (24)

QN0015173

Which expression is equivalent to 423 + 419?

(A) 419 + 423
(B) 423 – 419
(C) 419 – 423
(D) 423 × 419

Correct Answer: A

Explanation:

By the commutative property of addition.

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Question (25)

QN0015174

Using reasoning, 207 – 68 is equal to:

(A) 210 – 65
(B) 210 – 68
(C) 210 – 71
(D) 207 – 71

Correct Answer: C

Explanation:

Increasing 207 by 3 requires increasing 68 by 3 as well.

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Question (26)

QN0015175

Jasoda wants to calculate 84 – 9 mentally. Which method matches her strategy?

(A) Subtract 8 and add 1
(B) Subtract 10 and add 1
(C) Add 10 and subtract 1
(D) Subtract 11 and add 2

Correct Answer: B

Explanation:

Since 9 = 10 – 1.

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Question (27)

QN0015176

Using Jasoda’s strategy, 65 – 9 equals:

(A) 54
(B) 55
(C) 56
(D) 57

Correct Answer: C

Explanation:

65 – 10 + 1 = 56.

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Question (28)

QN0015177

Which expression is equivalent to subtracting 8 from a number n using a mental strategy?

(A) n – 10 – 2
(B) n + 10 – 2
(C) n – 10 + 2
(D) n + 8

Correct Answer: C

Explanation:

Since 8 = 10 – 2.

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Question (29)

QN0015178

Evaluate: 24 – (6 + 4) + 8

(A) 20
(B) 22
(C) 24
(D) 26

Correct Answer: B

Explanation:

24 – 10 + 8 = 22.

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Question (30)

QN0015179

Evaluate: 60 – (15 – 5) + 4

(A) 49
(B) 50
(C) 54
(D) 56

Correct Answer: C

Explanation:

60 – 10 + 4 = 54.

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Question (21)

The value of 34 – (9 + 12) is:

Explanation:

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Question (22)

Add brackets to make 56 – 14 – 8 equal to 34. Which is correct?

Explanation:

Link:

Question (23)

The value of –22 – (12 + 10) + 22 is:

Explanation:

Link:

Question (24)

Which expression is equivalent to 423 + 419?

Explanation:

Link:

Question (25)

Using reasoning, 207 – 68 is equal to:

Explanation:

Link:

Question (26)

Jasoda wants to calculate 84 – 9 mentally. Which method matches her strategy?

Explanation:

Link:

Question (27)

Using Jasoda’s strategy, 65 – 9 equals:

Explanation:

Link:

Question (28)

Which expression is equivalent to subtracting 8 from a number n using a mental strategy?

Explanation:

Link:

Question (29)

Evaluate: 24 – (6 + 4) + 8

Explanation:

Link:

Question (30)

Evaluate: 60 – (15 – 5) + 4

Explanation:

Link:

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