Factor trees, ladders, fireworks, rainbows... They're all the same thing. A way to display the prime factors of a given number. The prime factorization of 142 is 2 x 71. Arrange the 2 and the 71 however you wish.
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The GCF of 84, 105, 142, and 148 is 1.
1,2,3,5,6,10,15,30.
The greatest common factor of the numbers 142 and 842 is 2.
23,2,2 46,2 92
7,3,2,2 21,2,2 42,2 84