(38)
(39)
mixed number
Fine. Now let's tackle something a little bit
harder.
If you cannot secure the lowest
common denominator (l.c.d.) which is divisible
into
all
denominators,
multiply
the
denominators and the product will be the
l.c.d.
The l.c.d. of 2/3 + 4/7 + 1/2 is
3 x 7 x 2 = 42
(40)
2/3 + 4/7 + 1/2 = ****
In order to add these fractions we must change
them so all the denominators are the same.
To
change
these
fractions,
divide
the
denominator into the l.c.d. and multiply the
numerator and denominator by this number. For
example: 2/3, first divide 3 into 42, which
equals 14. Multiply the fraction 2/3 x 14/14
= 28/42
4/7, divide 7 into 42 which is 6.
Multiply
4/7 x 6/6 = 24/42.
1/2, divide 2 into 42 which is 21.
Multiply
1/2 x 21/21 = 21/42.
2/3 + 4/7 + 1/2 = 28/42 + 24/42 + 21/42
28/42 + 24/42 + 21/42 = 73/42 = 1 31/42
17
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