4. subtract
a.5/8 from -9/20
b.-2/3 from 5/9
c.3/4 from 7/8
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Answer: For substracting any fraction number we first find the lcm of the denominator
a) .5/8 from -9/20= LCM of 8 and 20 = 40
Now we should find the equivalent frction of 5/8 and -9/20 to 40
1) 5/8= _/40= 8 x 5 = 40 so we should multiply the numerator also by 5 because 8 x 5 gives 40 so the ans will be 25/40
2) 9/20= 20 x 2= 40 so we should multiply the numerator also by 2 because 20x 2 gives 40= 9 x 2 = 18 so we got as 18/40
Now it is easy to substract 25/40 - 18/40= 7/40
b) Do the same method to b also
b.-2/3 from 5/9= 6/9 - 5/9= 1/9
c. 3/4 from 7/8= 6/8 - 7/8= 1/8
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