Lowest Common Multiple and Highest Common Factor

Find the HCF of 30 and 36

• 2
• 3
• 4
• 6

Find the HCF of 25 and 35

• 10
• 5
• 7
• 1

What is the lowest common multiple (LCM) of 6 and 8?

• 6
• 8
• 48
• 24

What is the lowest common multiple (LCM) of 4 and 10?

• 4
• 40
• 15
• 20

Two neon signs are turned on at the same time. Both signs blink as they are turned on. One sign blinks every 9 seconds. The other sign blinks every 15 seconds. In how many seconds will they blink together again?

• 48 seconds
• 45 seconds
• 16 seconds
• 8 seconds

Find the HCF of 24 and 32

• 1
• 2
• 4
• 8

Find the HCF of 22 and 42

• 2
• 3
• 11
• 14

Find the HCF of 45 and 60

• 5
• 15
• 10
• 9

Find the Lowest Common Multiple of 9 and 6

• 18
• 36
• 38
• 72

What is the lowest common multiple of 15, 21 and 35?

• 3
• 5
• 105
• 315