MACHINE SHOP CALCULATION - OD1640 - LESSON 1/TASK 1
Multiply 5/8 by 2/5..
Time can be saved here by cancellation.
b.
Shop Work Problems.
In shop work, problems are met frequently that
are condensed to written work looking something like this: 25 2/5 x 6 1/3,
or 47 x 16 4/5.
Rule 1. To multiply two numbers, one or both of which are mixed numbers,
first reduce the mixed numbers to improper fractions by multiplying the
whole number by the denominator, and adding the numerator, as shown below.
Then multiply, as in multiplying two fractions.
EXAMPLE
Multiply 2 2/7 by 5 1/4.
2 2/7 = 16/6
5 1/4 = 21/4
Change to improper fractions and cancel.
c.
Mixed Numbers.
When one number is a mixed number and the other a
whole number, work as follows:
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