MACHINE SHOP CALCULATION - OD1640 - LESSON 1/TASK 1
(1) Rule 1.
Multiplying or dividing both numerator and denominator of a
fraction by the same number does not change the value of the fraction.
EXAMPLE
1/4 X 2/2 = 2/8 X 2/2 = 4/16.
Then 1/4, 2/8, and 4/16 all represent the
same fraction or value.
(2) Rule 2.
Multiplying the numerator or dividing the denominator by a
number multiplies the fraction by that number.
EXAMPLE
(3) Rule 3.
Dividing the numerator or multiplying the denominator by a
number divides the fraction by that number.
EXAMPLE
b.
Changing to a Given Denominator. Changing a whole or mixed number, or
a fraction, to a fraction of a given denominator:
(1) Rule 1. First change 1 to a fraction of the given denominator.
Then
multiply the numerator by the given whole number.
EXAMPLE
Reduce 5 to 6ths.
Since 1 = 6/6, 5 = 5 x 6/6 = 30/6.
(2) Rule 2. With regard to a mixed number, change the whole number to a
fraction. Then add to
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