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Question (21)

QN0015607

Find the value of 2ab when a = 3 and b = 5.

(A) 30
(B) 15
(C) 10
(D) 25

Correct Answer: A

Explanation:

2 × 3 × 5 = 30.

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Question (22)

QN0015608

Which of the following shows correct omission of multiplication symbols?

(A) 4×a×b = 4ab
(B) 4×a×b = 4+a+b
(C) 4×a×b = ab4+
(D) 4×a×b = 4(a+b)

Correct Answer: A

Explanation:

4 × a × b is written as 4ab.

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Question (23)

QN0015609

The expression pqr means:

(A) p+q+r
(B) p×q×r
(C) p−q−r
(D) p÷q÷r

Correct Answer: B

Explanation:

Adjacent letters indicate multiplication.

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Question (24)

QN0015610

Evaluate 2mn when m = 6 and n = 7.

(A) 42
(B) 84
(C) 13
(D) 72

Correct Answer: B

Explanation:

2 × 6 × 7 = 84.

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Question (25)

QN0015611

Which is the correct form of 10 × a × b × c?

(A) 10abc
(B) abc10+
(C) 10+a+b+c
(D) 10(a+b+c)

Correct Answer: A

Explanation:

The multiplication symbols are omitted.

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Question (26)

QN0015612

The coefficient in the term 8x is:

(A) x
(B) 8
(C) 8x
(D) 1

Correct Answer: B

Explanation:

The numerical factor is called the coefficient.

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Question (27)

QN0015613

The coefficient in the term 15mn is:

(A) mn
(B) 15
(C) m
(D) n

Correct Answer: B

Explanation:

15 is the numerical coefficient.

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Question (28)

QN0015614

Which term has coefficient 7?

(A) x7
(B) 7x
(C) x+7
(D) 7+x

Correct Answer: B

Explanation:

The coefficient is the number multiplying the variable.

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Question (29)

QN0015615

Evaluate 12ab when a = 2 and b = 3.

(A) 72
(B) 36
(C) 24
(D) 12

Correct Answer: A

Explanation:

12 × 2 × 3 = 72.

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Question (30)

QN0015616

Simplify: 2 × 3 × p × q

(A) 5pq
(B) 6pq
(C) 23pq
(D) pq6+

Correct Answer: B

Explanation:

2 × 3 = 6, so 6pq.

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