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0.4 become 40 over 100 because we need to naive the decimal to ways to the right
3 over 10 become 3 and 1 over 10 because 3goes to 10 3 time and 1 is the left over and the 10 stays the same

4) 3/5 [.6 = 60/100 = 6/10 = 3/5]
5) 2/5 [ same working out as above]
6) 3 & 7/10
7) 4 & 1/4
8) 2 & 3/20

9) 0.3
10) 0.5
11) 0.6
12) 0.66
13) 6.4
14) 12.06
15) 7.22
16) 1.15

17) 3/4
18) 1 & 1/2
19) 1 &1/4, 1.25
20) A because the number 0.125 is less than 1/4, thus point A is the only possible options (additionally point a represents 1/8 which is equivalent to 0.125)