**MACHINE SHOP CALCULATION - OD1640 - LESSON 1/TASK 1**

Step 3.

Subtract the digit 6 from the

digit 7. 7 - 6 = 1. The remainder

is 1. The remainder must be less

than the divisor 3.

Step 4.

Since the remainder is less than

the divisor 3, bring down the next

digit, 5.

Step 5.

Divide the number 15 by 3.

15 ƒ 3 = 5. Write the 5 above

the 5 in ones position.

Step 6.

Multiply the divisor 3 by the

digit 5. 3 x 5 = 15. Write the

number 15.

Step 7.

Subtract the number 15 from 15.

15 - 15 = 0, indicating that the

calculation is complete.

Step 8.

Check by multiplying the quotient

by the divisor. 25 x 3 = 75.

3.

Common Fractions

a.

*General*. A fraction is any part of an object or number. For example,

figure 2 on the following page shows a block of wood as one unit. When it

is cut in half, each piece becomes a fraction of the original unit, 1 of 2

equal parts, or 1/2 of the original unit. Cut each of these halves in half

again and each piece is now 1 of 4 equal parts, or 1/4 of the original unit.

b.

*Definitions*.

(1) *Fraction*. A fraction is an indicated division. It expresses one or

more of the equal pieces or parts into which something has been divided.

**5**