2 and 1
2 is a Prime number
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-8
1, 2, 5 and 10
10, 100, 2, 1, 16... and more
2, 4, 5, 8, 10, 20
2/5 This one is simple since they both end in 0. Zeros can be crossed out. Ex: 200/500 is the same as 2/5 otherwise find a number that goes into the top number(denominator) and botom number (numerator) 10 goes into 20, 2 times. 10 goes into 50, 5 times. say you thought the biggest number that could go into both was 5. 5 goes into 20, 4 times. 5 goes into 50, 10 times. This makes it 4/10. You can now see that 2 can go into both of those numbers making the answer 2/5.