NumbersExercise 38 - Example (Page 1) | HomeHWFORKIDS | Numbers Exercises | Page1 of 2 | Page2 of 2 |

Find the factors:(Start with 2,3,4...)2| 1802| 903| 453| 155 |
2|722| 362| 183| 93 |
2|2103| 1055| 357 |

Factors of 72 =

Factors of 210 =

Common factors of 180, 72 and 210 are:

GCF =

Find the factors:(Start with 2,3,4...)2| 147 |
2|282| 147 |
2|423| 217 |

Factors of 28 =

Factors of 42 =

Common factors of 14, 28 and 42 are:

GCF =

Find the factors:(Start with 2,3,4...)2| 1802| 903| 453| 155 |
2|722| 362| 183| 93 |
2|2103| 1055| 357 |

Factors of 72 = 2 x 2 x 2 x 3 x 3 = 2

Factors of 210 = 2 x 3 x 5 x 7

Take all the highest factors = 2

2|210, 180, 72 2| 105, 90, 36 2| 105, 45, 18 3| 105, 45, 9 3| 35, 15, 3 5| 35, 5, 1 7, 1, 1 L.C.M = 2 x 2 x 2 x 3 x 3 x 5 x 7 = 2520 |

L.C.M. of 12 and 20 = 60

Product of above G.C.F and L.C.M = 4 x 60 = 240

Product of 12 and 20 = 240

G.C.F x L.C.M of two numbers = Product of the numbers

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