Grade 6 · Math
Find the greatest common factor practice
Find the greatest whole-number factor shared by two positive integers.
Opening your practice adventure…
Try a sample
What is the greatest common factor of 45 and 75?
- 15
- 17
- 16
- 14
See the answer & why
15
15 divides both numbers. No greater whole number is a factor of both.
A little hint: List the factors or compare prime factorizations.
A teaching tip
A common factor must divide both numbers exactly; choose the greatest one.