Least Common Multiple of 4 and 7:
List in order the multiples of each number:
The multiples of 4 are 4, 8, 12, 16, 20,24 … and so on.
The multiples of 5 are 7, 14, 21, 28, 35,42 …and so on.

The first common multiple of both numbers is 28.
So the Least common Multiple is 28.

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Find the greatest common factor.

Pascals Triangle

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