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Least Common Multiple or Least Common Denominator

Objective: I can find the least common multiple or least common denominator.

One way to find the least common multiple (LCM) is

Step 1: List the multiples of the given numbers.

Step 2: Find the multiples common to the given numbers.

Step 3: Select the smallest common multiple.

Read the lesson on least common multiple if you need to learn how to find the lowest common multiple.

We can use the least common multiple when adding or subtracting fractions with unlike denominators. It is then called the least common denominator.

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Find the LCM of the following numbers:

a) 4, 6 and 30

b) 8, 12 and 20

c) 10, 20 and 25

d) 12, 15 and 24

e) 8, 15 and 24

f) 12, 16 and 25

g) 20, 30 and 45

h) 32, 48 and 80

i) 14, 16 and 56

j) 15, 18, 42

We hope that the free math worksheets have been helpful. We encourage parents and teachers to select the topics according to the needs of the child. For more difficult questions, the child may be encouraged to work out the problem on a piece of paper before entering the solution. We hope that the kids will also love the fun stuff and puzzles.

Do check out our Interactive Zone for many other types of free dynamic on-line math worksheets.

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