What this lesson shows
List the factors of 12 and 18: the greatest both share is 6. List their multiples: the least both share is 36.
The worked example
The lesson works this one step by step: 12 and 18. Then your kid tries one like it on paper.
The steps
- List factors, ring the shared ones
- Greatest common factor: the biggest shared
- Least common multiple: the first shared
Helping at home
List every factor of each number and ring the ones both lists share: the greatest is the greatest common factor. Then count by each number: the first multiple both lists share is the least common multiple.
If your kid gets stuck
Factors divide the number. Multiples count by it.
Watch it with Lux
With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.
More in this unit
- Adding fractions with unlike denominators
- Renaming both fractions
- Mixed numbers, unlike denominators
- Adding tops and bottoms
- Same-size wholes
- Fraction stories, add and subtract
- A fraction of a fraction
- Mixed number times a fraction
- A third of it, or a third of a yard?
- Bigger or smaller, without computing
- Times a fraction can shrink
- Area with fraction sides
- Area with decimal sides
- Percents are parts of 100