(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

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