Other skillsGrade 5
Greatest Common Divisor practice
Find the greatest common factor of two numbers, such as 45 and 27: 9.
Example problems
15
and
12
of
GCD
＝
3
18
and
6
of
GCD
＝
6
45
and
27
of
GCD
＝
9
How a practice round works
A round has 10 problems from this skill. Type the digits into the dotted boxes; if a digit is wrong, you simply try again. Get 5 of your last 6 problems right on the first try to master the skill, then keep practicing to earn up to three stars.