Unit 9 : Multiples and Factors

What number below are factors of 56.

• 3

• 5

• 6

• 7

• 8

Which of these numbers are multiples of 21

• 3

• 7

• 21

• 42

• 62

Which of these number(s) are multiples of 8

• 4

• 8

• 16

• 28

• 48

What number below is a factor of 17.

• 1

• 8

• 34

• 40

What is the Highest Common Factor of 28 and 49?

What is the Lowest Common Multiples of 6, 8 and 12?

• 2

• 12

• 24

• 36

What is the Lowest Common Multiples of 4 and 15?

• 4

• 15

• 45

• 60

What is the Highest Common Factor of 15, 21, 27?

• 1

• 3

• 35

• 945

At a bus station, the busses leaving for City A and City B. Both leave together at 07.00 a.m. Following this, the bus to City A leaves every 20 minutes and the bus to City B leaves every 25 minutes.

At what time will the buses next be leaving the station at the same time?

What is the divisibility rule for 2?

• All number is divisible by 2

• The last digit is 2

• The last digit is even number(0,2,4,6,8)

• The last 2 digit are divisible by 4