quote:

Originally posted by mathy:
hi everybody:

i want you to see this method of calculating any fraction ( adding and subtracting)

is it right or wrong?!

e.g

2/5+7/12
first:

multiply the first fraction's dinominator with the second fraction's numerator:5*7=35

second:

multiply the first fraction's numerator with the second fraction's dinominator:2*12=24

third:

multiply all dinominators: 5*12=60

fourth:

add the two answers( the first and second): 35+24=59

fifth:

put the answer in the fourth step in the numerator of the new fraction and the answer in the third step in the dinominator of the new fraction: 59/60

****In subtracting you can make the same but you must put the bigger number of the first and second at the end: 2/5-7/12=

2*12=24

-7*5=-35

-35+24=-11

the dinominator will be : 5*12=60

the subtraction of the two fractions is equal to -11/60



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