GCF & LCM Practice — Free Step-by-Step Drills
Practice finding the greatest common factor and least common multiple with this free tool. It generates problems at your level, checks your answer instantly, and shows the prime-factorization method step by step.
How the practice works
- Pick a difficulty.
- Find the GCF or LCM and press Check.
- See the feedback and step-by-step solution, then press Next.
GCF vs. LCM
The GCF is the largest number that divides both numbers; the LCM is the smallest number both divide into. Prime factorization makes both easy — the solution panel shows the factor trees.
Original price was: $109.99.$54.99Current price is: $54.99.
Frequently asked questions
What’s the difference between GCF and LCM?
The GCF is the greatest common factor (largest shared divisor); the LCM is the least common multiple (smallest shared multiple).
Is it free?
Yes — unlimited problems, no sign-up, with progress saved in your browser.
Original price was: $109.99.$54.99Current price is: $54.99.
Does it show the method?
Yes — each answer comes with the prime-factorization steps.
Original price was: $109.99.$54.99Current price is: $54.99.
Read the full lesson: learn the method step by step.
Original price was: $27.99.$17.99Current price is: $17.99.
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