make a factoer tree
what is 20 made up of
what is 30 made up of
now what number(s) is/are the same that is your anwser
2 is a factor of both 20 and 30..can you think of anymore? I think there are two more.
30 = 2 * 3 * 5
20 = 2 * 2 * 5
2 * 5 = 10
2 a factor of 15 number sentence
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