(210,1)(105,2)(70,3)(42,5)(35,6)(30,7)(21,10)(15,14)
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The factor pairs of 210 are: 1 and 210 2 and 105 3 and 70 5 and 42 6 and 35 7 and 30 10 and 21 14 and 15
The factor pairs of 210 are (210,1)(105,2)(70,3)(42,5)(35,6)(30,7)(21,10)(15,14) None of them add up to 23. If that was -210, you could use 30 and -7.
Yes. Factor pairs are always repeated across pairs since factor pairs are certain kinds of pairs.
The factor pairs of 27 are 1x27 and 3x9.
No. 42 is a factor of both 168 and 210. The GCF is 42.