1,3,5,15
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Factors are numbers you can multiply together to get another number. 15: 1, 3, 5, 15
-- List all the factors of 15. -- List all the factors of 30. -- Spot the group of numbers that are on both lists. -- The biggest one of those is the GCF. It should be close to 15.
There are 15 factors in all.
You need to Writ edown all the factors.. :)
1 and 7