Lowest common multiple of two numbers

Difficulty Standard · Set m9cj5d

Fill in what you can and press Check. Nothing you type is sent anywhere.

1
What is the least common multiple of 6 and 13?
2
What is the least common multiple of 5 and 16?
3
What is the least common multiple of 9 and 13?
4
What is the least common multiple of 10 and 12?
5
What is the least common multiple of 21 and 6?
6
What is the least common multiple of 4 and 13?
7
What is the least common multiple of 6 and 8?
8
What is the least common multiple of 8 and 7?
9
What is the least common multiple of 11 and 17?
10
What is the least common multiple of 10 and 12?
11
What is the least common multiple of 9 and 6?
12
What is the least common multiple of 12 and 15?
13
What is the least common multiple of 6 and 20?
14
What is the least common multiple of 19 and 5?
15
What is the least common multiple of 14 and 13?
16
What is the least common multiple of 7 and 13?
17
What is the least common multiple of 23 and 22?
18
What is the least common multiple of 17 and 10?
19
What is the least common multiple of 8 and 6?
20
What is the least common multiple of 17 and 22?

What is in this set

The numbers in this set run from 4 to 24.
62% of them share no factor at all.
38% of them share a factor.
A careful solution takes 3 written steps on average.
The mistake this set invites most often, in 100% of the problems: that is the greatest common factor — a common multiple is never smaller than either number.
Answers are a whole number.

Drawing 240 problems from this page produced 184 different ones, 77% — so a sheet of 20 is a new sheet almost every time.

The same skill, harder or easier

We would put this in front of a grade 6 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.