P.4 Revision (factors, prime number, direction)

70 is a ___________ of 7.

• factor

• multiple

22 is a ________ of 132.

• factor

• multiple

(a)   is both a factor and a multiple of 61.

21 is a factor of _______.

• 1

• 3

• 7

• 21

There are 3 factors for the number 25. How many multiples does 25 have?

• 1

• 3

• 25

• Infinite many

List all the factors of 32. (from smallest to largest)

(a)  

For numbers up to 100, there are (a)   prime numbers.

Which of the following is not a prime number?

• 91

• 31

• 17

• 53

The smallest prime number is 1.

• True

• False

All even numbers must be composite numbers.

• True

• False