Printable Least Common Multiple Worksheets
Printable least common multiple worksheets for 4th and 5th grade, with an answer key on every sheet. The sets below cover 4 different skills, so you can start where your child actually is. Available as speed drills and word problems.
Targeted Practice by Skill
LCM by listing multiples
Format 1
LCM by listing multiples
Format 2
LCM by listing multiples
Format 3
LCM by prime factorization
Format 1
LCM by prime factorization
Format 2
LCM by prime factorization
Format 3
LCM of two numbers to 100
Format 1
LCM of two numbers to 100
Format 2
LCM of two numbers to 100
Format 3
LCM and GCF together
Format 1
LCM and GCF together
Format 2
LCM and GCF together
Format 3
About Least Common Multiple
What this skill is
Least Common Multiple (LCM) is the smallest positive shared multiple of two or more numbers (e.g., LCM of 4 and 6 is 12).
When children learn it
LCM calculations are taught in 4th and 5th grade, supporting unlike denominator fraction addition.
Teaching Tips
- List multiples of the larger number first, checking if the smaller number divides them.
- Highlight the first matching shared multiple.
Common Mistakes
- Multiplying two numbers together when a smaller common multiple exists (using 24 instead of 12 for 4 and 6).
- Confusing LCM with GCF.