# Worksheet: Finding and Using the Lowest Common Multiple

Q1:

What is the least common multiple of 7 and 5?

Q2:

What is the least common multiple of 4 and 6?

Q3:

Find the LCM of 49 and 6.

• A 104
• B 55
• C 165
• D 294

Q4:

Find the LCM of 6, 15, and 40.

Q5:

Find the LCM of 4, 6, and 49.

Q6:

Find the LCM of 4, 18, and 46.

Q7:

Find the LCM of , and 4.

Q8:

List the next five common multiples after the LCM of 4 and 9.

• A2, 4, 6, 8, 10
• B36, 72, 108, 144, 180
• C2, 3, 4, 5, 6
• D72, 108, 144, 180, 216
• E72, 144, 216, 288, 360

Q9:

List the next five common multiples after the LCM of 2 and 16.

• A4, 8, 12, 16, 20
• B16, 32, 48, 64, 80
• C4, 6, 8, 10, 12
• D32, 48, 64, 80, 96
• E32, 64, 96, 128, 160

Q10:

A botanist waters one plant every 7 days and another every 40 days. If she waters both plants today, in how many days will she water the two plants on the same day again?

• Aafter 47 days
• Bafter 279 days
• Cafter 46 days
• Dafter 280 days

Q11:

Victoria goes to the library every 6 weeks. Scarlett goes to the same library every 7 weeks. If they met at the library one day, how long would it be before both of them are at the library in the same week again?

Q12:

Write three numbers that have an LCM of 210.

• A2, 7, 21
• B5, 15, 21
• C2, 15, 5
• D2, 15, 21
• E2, 5, 7