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Question (31)

QN0020202

If the bottom row is 8, 15, 7, the topmost number is:

(A) 43
(B) 44
(C) 45
(D) 46

Correct Answer: C

Explanation:

8 + 2×15 + 7 = 45.

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Question (32)

QN0020203

If the bottom row is 18, 9, 6, the topmost number is:

(A) 41
(B) 42
(C) 43
(D) 44

Correct Answer: B

Explanation:

18 + 2×9 + 6 = 42.

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Question (33)

QN0020204

A pyramid has top number 50 and bottom row 12, x, 14. The value of x is:

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

Correct Answer: B

Explanation:

12 + 2x + 14 = 50 ⇒ x = 12.

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Question (34)

QN0020205

If the bottom row is 16, 8, 4, the topmost number is:

(A) 34
(B) 35
(C) 36
(D) 37

Correct Answer: C

Explanation:

16 + 2×8 + 4 = 36.

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Question (35)

QN0020206

The coefficient of the leftmost bottom entry in the top expression a + 2b + c is:

(A) 0
(B) 1
(C) 2
(D) 3

Correct Answer: B

Explanation:

The coefficient of a is 1.

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Question (36)

QN0020207

The coefficient of the rightmost bottom entry in the top expression a + 2b + c is:

(A) 1
(B) 2
(C) 3
(D) 4

Correct Answer: A

Explanation:

The coefficient of c is 1.

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Question (37)

QN0020208

If the bottom row is 21, 7, 14, the topmost number is:

(A) 47
(B) 48
(C) 49
(D) 50

Correct Answer: C

Explanation:

21 + 2×7 + 14 = 49.

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Question (38)

QN0020209

If every number in the bottom row is doubled, the topmost number will:

(A) Remain unchanged
(B) Double
(C) Triple
(D) Increase by 2

Correct Answer: B

Explanation:

The top expression is linear in all bottom-row numbers.

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Question (39)

QN0020210

A number pyramid demonstrates which mathematical idea most directly?

(A) Repeated addition and pattern formation
(B) Data collection
(C) Measurement
(D) Probability

Correct Answer: A

Explanation:

Number pyramids are built using addition patterns.

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Question (40)

QN0020211

Which statement about a three-row number pyramid is always true?

(A) The top number equals the sum of all bottom numbers.
(B) The top number equals twice the middle bottom number plus the other two bottom numbers.
(C) The top number equals the product of the bottom numbers.
(D) The top number equals the difference of the bottom numbers.

Correct Answer: B

Explanation:

Top = a + 2b + c for bottom row a, b, c.

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Question (31)

If the bottom row is 8, 15, 7, the topmost number is:

Explanation:

Link:

Question (32)

If the bottom row is 18, 9, 6, the topmost number is:

Explanation:

Link:

Question (33)

A pyramid has top number 50 and bottom row 12, x, 14. The value of x is:

Explanation:

Link:

Question (34)

If the bottom row is 16, 8, 4, the topmost number is:

Explanation:

Link:

Question (35)

The coefficient of the leftmost bottom entry in the top expression a + 2b + c is:

Explanation:

Link:

Question (36)

The coefficient of the rightmost bottom entry in the top expression a + 2b + c is:

Explanation:

Link:

Question (37)

If the bottom row is 21, 7, 14, the topmost number is:

Explanation:

Link:

Question (38)

If every number in the bottom row is doubled, the topmost number will:

Explanation:

Link:

Question (39)

A number pyramid demonstrates which mathematical idea most directly?

Explanation:

Link:

Question (40)

Which statement about a three-row number pyramid is always true?

Explanation:

Link:

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