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Question (31)

QN0027250

Which number is nearest to 150?

(A) 147
(B) 148
(C) 149
(D) 146

Correct Answer: C

Explanation:

149 is only 1 away from 150.

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Question (32)

QN0027251

If a total is estimated as 100 and the exact answer is 101, the estimate is:

(A) Very close
(B) Very far
(C) Wrong
(D) Impossible

Correct Answer: A

Explanation:

The estimate differs by only 1.

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Question (33)

QN0027252

Which estimate is closest to 63 + 26?

(A) 70
(B) 80
(C) 90
(D) 100

Correct Answer: C

Explanation:

63 ≈ 60 and 26 ≈ 30, so about 90.

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Question (34)

QN0027253

What is the exact answer to 63 + 26?

(A) 87
(B) 88
(C) 89
(D) 90

Correct Answer: C

Explanation:

63 + 26 = 89.

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Question (35)

QN0027254

Which estimate is closest to 156 − 65?

(A) 80
(B) 90
(C) 100
(D) 110

Correct Answer: B

Explanation:

160 − 70 ≈ 90.

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Question (36)

QN0027255

What is the exact answer to 156 − 65?

(A) 89
(B) 90
(C) 91
(D) 92

Correct Answer: C

Explanation:

156 − 65 = 91.

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Question (37)

QN0027256

Which number is nearest to 90?

(A) 87
(B) 88
(C) 89
(D) 86

Correct Answer: C

Explanation:

89 is only 1 away from 90.

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Question (38)

QN0027257

Why do we estimate before solving some problems?

(A) To get a rough idea of the answer
(B) To avoid counting
(C) To make numbers bigger
(D) To change the question

Correct Answer: A

Explanation:

Estimation helps us predict a reasonable answer.

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Question (39)

QN0027258

Which estimate is closest to 20 + 41?

(A) 50
(B) 60
(C) 70
(D) 80

Correct Answer: B

Explanation:

20 + 41 ≈ 60.

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Question (40)

QN0027259

What is the exact answer to 20 + 41?

(A) 59
(B) 60
(C) 61
(D) 62

Correct Answer: C

Explanation:

20 + 41 = 61.

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