Becuause when you divide those numbers into twenty, the answers are whole numbers.
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Common factors of 20 are; 1,2,4,5, and 20. 1x20=20, 2x10=20, 4x5=20, 5x4=20, 20x1+=20. If you have to show your work then just check mine.The factors of 20 are 1,2,4,5,10 and 20. For them to be common, they have to be compared to another set of factors.
20 has six factors.
Factors of 20:1,2,4,5,10,20Factors of 65:1,5,13,65The common factors are 1 and 5.
The factors of 15 are 1,3,5,15 The factors of 20 are 1,2,4,5,10,20
2,4,8,10 and 16 are factors of 400.