Numbers 2 ( O'level Revision)

Choose a common multiple of 8 and 14.

• 168

• 112

• 178

Choose the complete list of factors of 81.

• 3, 9, 27

• 1, 3, 9, 81

• 81, 9 3

The prime factor of 81 is

Write, in figures, the number

one hundred and five thousand and two

210 211 212 213 214 215 216

From the list of numbers, tick all the correct answers

• 216 is a square number

• 216 is a cube number

• 215 is an even number

• 211 is a prime number

Which of the following numbers are irrational?

• $\frac{2}{3}$

• $\sqrt{36}$

• $\sqrt{3}+\sqrt{6}$

• $\pi$

• $8^{\frac{1}{3}}$

Here is a list of numbers.

2 5 7 8 9 12

Write down a number from the list which is

(i) a multiple of 6, .....................................

(ii) a factor of 15, .....................................

(iii) a square number.........................

factor, multiple, square, square root ,half

Use a word from the list above to complete the following sentence.

10 is a ......................................... of 5

• multiple

• factor

• square

• square root

• half

From the list below, write down the odd number.

10 15 18 20 24

22 17 25 41 39 4

The difference between the two prime numbers in the list above.

• 25

• 24

• 31

• 22