Printable Least Common Multiple Worksheets
Least common multiple worksheets teach 4th and 5th graders to find the smallest shared multiple of two numbers. These printable sheets build common denominator foundations with full answer keys.
Least Common Multiple Practice Pack. Ready to Print.
Structured, printable skill sheets with step-by-step guidance for Least Common Multiple.
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LCM by listing multiples
Find LCM by listing multiples
LCM by listing multiples
Identify the least common multiple
LCM by listing multiples
LCM by listing multiples (word problems)
LCM by prime factorization
Build factor trees, find the LCM
LCM by prime factorization
Find LCM from prime factorizations
LCM by prime factorization
LCM by prime factorization (word problems)
LCM of two numbers to 100
LCM of two numbers to 100 (factor trees)
LCM of two numbers to 100
Choosing efficient LCM strategies (to 100)
LCM of two numbers to 100
LCM of numbers up to 100 (word problems)
LCM and GCF together
Find both GCF and LCM
LCM and GCF together
Decide if each GCF and LCM fact is true
LCM and GCF together
GCF and LCM in two-part word problems
About Least Common Multiple
What this skill is
The Least Common Multiple (LCM) is the smallest positive whole number that is a multiple of two or more given numbers, used to find common denominators when adding or subtracting fractions.
When children learn it
Introduced in 4th and 5th grade to support fraction addition and subtraction (CCSS 5.NF.A.1) and finalized in 6th grade.
Teaching Tips
- Start with the BIGGER number: for 4 and 6, write multiples of 6 (6, 12, 18...). Test each one with 4: Does 4 go into 6? No. Does 4 go into 12? Yes! Stop right there, 12 is your LCM.
Common Mistakes
- Simply multiplying the two numbers together instead of finding the true least common multiple (e.g., using 24 for 4 and 6 instead of 12).
- Confusing LCM with GCF and giving a smaller factor.
- Calculation slips when skip counting large numbers.