Find any factor - like 2, then divide by 2, to get the other factor: 2 x 248. Continue finding more factors for the number to the right, until you divided the number into prime factors.
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The factors of 420 are: 1,2,3,4,5,6,7,10,12,14,15,28,30,35,42,60,70,84,105,140,210,420
Factors are numbers you can multiply together to get another number. Therefore, all the factors of 21 are as follows: 1,3,7,21.
All Factors of 142:1, 2, 71, 142
The factors of 223 are: 1, 223
All the factors of 11 are 1,11. Because 11x1=11 and nothing else does. All the factors of 11 are 1,11.Because 11x1=11 and nothing else does.