Which of the following numbers is not a factor of 144?

Factors and Multiples Quiz

Quiz
•
Mathematics
•
8th Grade
•
Hard
Qaiyyum Hasnan
Used 3+ times
FREE Resource
7 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
8
12
28
36
Answer explanation
To determine which number is not a factor of 144, we check each option. 8, 12, and 36 are factors of 144, but 28 is not, as 144 divided by 28 does not yield a whole number.
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which of the following numbers is not a prime factor of 462?
3
7
11
13
Answer explanation
To find the prime factors of 462, we can divide it by prime numbers. 462 is divisible by 2, 3, 7, and 11, but not by 13. Therefore, 13 is not a prime factor of 462.
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
3 is a factor of x while x is a factor of 126. What is the possible value of x?
4
8
14
21
Answer explanation
Since 3 is a factor of x, x must be a multiple of 3. The factors of 126 are 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, and 126. Among the choices, only 21 is a multiple of 3 and a factor of 126.
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
How many factors are there for 15?
2
3
4
5
Answer explanation
The factors of 15 are 1, 3, 5, and 15. Counting these gives us a total of 4 factors. Therefore, the correct answer is 4.
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
56 and 120 are multiples of
6
8
7
12
Answer explanation
56 and 120 are both divisible by 7. For 56, 56 ÷ 7 = 8, and for 120, 120 ÷ 7 = 17.14 (not an integer). Thus, they are not multiples of 6, 8, or 12, making 7 the correct choice.
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Find the lowest common multiple (LCM) of 4,6, and 9.
18
36
54
72
Answer explanation
To find the LCM of 4, 6, and 9, we can use their prime factorizations: 4 = 2^2, 6 = 2^1 * 3^1, and 9 = 3^2. The LCM takes the highest power of each prime: 2^2 and 3^2. Thus, LCM = 2^2 * 3^2 = 4 * 9 = 36.
7.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Calculate the sum of the lowest common multiple (LCM) and highes common factor (HCF) of 8,12 and 16.
40
44
52
56
Answer explanation
The LCM of 8, 12, and 16 is 48, and the HCF is 4. Their sum is 48 + 4 = 52, which matches the correct answer choice.
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