1 6
- = --
2 12
2 8
- = --
3 12
3 9
- = --
4 12
_Ans._ 6/12, 8/12 and 9/12.
The L. C. M. of the denominators 2, 3 and 4 is 12. Hence, 12 is the L.
C. D. to which the given fractions can be reduced. Then to change 1/2 to
12ths, say, 1/2 of 12 is 6, and write it over 12; to change 2/3 to
12ths, say 2/3 of 12 is 8, and write it over 12; to change 3/4 to 12ths,
say, 3/4 of 12 is 9, and write it over 12.
Fractions must be reduced to a common denominator to be added or
subtracted.