SCAT Mathematical Reasoning: Number Properties 2

Question 1

What is the least common multiple (LCM) of 4 and 6?

Accepted Answer

12

Answer

The LCM of 4 and 6 is 12 because 12 is the smallest number divisible by both 4 and 6.

Question 2

Which number is a common factor of both 18 and 24?

Accepted Answer

6

Answer

6 divides evenly into both 18 (18 ÷ 6 = 3) and 24 (24 ÷ 6 = 4).

Question 3

A number is divisible by 9 if:

Accepted Answer

The sum of its digits is divisible by 9

Answer

The divisibility rule for 9 states that if the sum of all digits is divisible by 9, the whole number is too.

Question 4

What is the greatest common factor (GCF) of 12 and 18?

Accepted Answer

6

Answer

The factors of 12 are 1, 2, 3, 4, 6, 12 and of 18 are 1, 2, 3, 6, 9, 18; the greatest common factor is 6.

Question 5

Which of the following is NOT a multiple of 7?

Accepted Answer

54

Answer

54 ÷ 7 = 7.7…, so 54 is not a multiple of 7; the others (28, 42, 49) are all divisible by 7.

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