Week 1: Common Multiples and Least Common Multiples

1. Which of the following is the common multiples of 7 and 14?

• 7
• 21
• 28
• 49

2. Which of the following sets of number is the common multiples of 6 and 36?

• 1 and 6.
• 60 and 360.
• 12 and 72.
• 36 and 72.

3. What is the L.C.M. of 12 and 15?

4. Which of the following is the common multiples of 5 and 45?

• 365
• 400
• 900
• 955

5. Which of the following expressions can be used to find the L.C.M. of 15 and 50?

• 5 × 2 × 10
• 5 × 2 × 2 × 2
• 5 × 3 × 10
• 10 × 5 × 5

6. Which of the following expressions can be used to find the L.C.M. of 26 and 65?

• 13 × 2 × 5
• 5 × 3 × 15
• 26 × 2
• 13 × 2 × 2

7. Which of the following expressions can be used to find the L.C.M. of 18 and 24?

• 2 × 2 × 4 × 3
• 2 × 3 × 3 × 4
• 3 × 3 × 4 × 3
• 4 × 3 × 2 × 2

8. What is the L.C.M. of 6 and 9?

9. The L.C.M. of 30 and ____ is 90.

• 60
• 45
• 15
• 75

10. The L.C.M. of 28 and ____ is 84.

• 14
• 36
• 48
• 84