1/7 + 2/14 = 4/14
5/10 + 10/20 = 1
1/4 + 1/24 = 7/24
5/20 + 1/10 = 7/20
9/18 + 1/36 = 19/36
1/2 + 1/4 = 3/4
3/4 + 1/2 = 1 1/4
1/3 + 7/12 = 11/12
5/100 + 5/1000 = 55/1000
7/20 + 3/10 = 13/20
I don't think you need 20 examples, it's blatantly obvious the process involved.
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adding fractions
6/20
3/20
44
Negative 15 minus 5 can be solved by subtracting 5 from -15. This results in -20, as subtracting a positive number from a negative number increases the magnitude of the negative value. In mathematical terms, -15 - 5 = -20.