1. Write down all the factors of 150.
2. Which of the following numbers is the multiple of both 5 and 6?
10, 15, 25, 30, 36
3. Which of the following set of numbers are the factors of 64?
a) 1, 2, 3, 4, 6, 12, 64
b) 2, 4, 8, 16, 32, 64
c) 1, 3, 4, 8, 16, 64
d) 1, 2, 4, 8, 16, 32, 64
e) 2, 3, 4, 8, 16, 32, 64
4) The sum of all the factors of a number is double the number. Find the number. (a number less than 10)
5) Write down the first five multiples of 3.
Write down the first five multiples of 5.
What is the lowest common multiple of 3 and 5?
6) Write down the first six multiples of 6.
Write down the first six multiples of 8.
What is the lowest common multiple of 6 and 8?
7) Write down the first three multiples of 4.
Write down the first three multiples of 8.
What is the lowest common multiple of 4 and 8.
8) Write down the first ten multiples of 12.
Write down the first ten multiples of 14.
What is the lowest common multiple of 12 and 14?
9) Which of the following numbers has both 7 and 8 as its factors?
48, 49, 56, 64, 72
10) Which of the following numbers has both 3 and 4 as its factors?
64, 72, 80, 86, 90
11) Which of the following numbers has both 3 and 6 as its factors?
78, 64, 82, 88, 93
12) Anna says, "All the multiples of 6 are even numbers." Is she right?
13) Anna says, "All even numbers are divisible by 4." Is she right?
14) All the numbers divisible by 4 are divisible by 2. Are all the numbers divisible by 2 divisible by 4?
15) It is a number less than 20 and has 3 and 5 as its factors. What is the number?
16) It is a number less than 50. It is an even number and has 3 and 7 as its factors. What is the number?
17) Which of the following numbers is a prime number?
15, 51, 81, 83, 93
18) Is number 1 a prime number?
19) What prime number is the nearest to 100?
20) It is a prime number which is less than 100. If you add 1 to it, you will get a multiple of 12. If you subtract 3 from it, you will get a multiple of 10. What is the number?
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