490
/ \
245 2
/ \
49 5
/ \
7 7
490=7*7*5*2
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greatest common factor of 490 and 540 is 10.
70 35,2 7,5,2 98 49,2 7,7,2 2 x 5 x 7 x 7 = 490, the LCM
factor tree of 216
The prime factor tree of 280 is:140,270,2,235,2,2,27,5,2,2,2
Factor Tree of 20: ........20 ......../ \ .......4 5 ....../ \ .....2 2