MACHINE SHOP CALCULATION - OD1640 - LESSON 1/TASK 1
EXAMPLE 1.
Add 128 to 475.
Step 1.
Add the digits in the ones position.
5 + 8 = 13. Write 3 under the ones
position. Carry over the 1 to the
tens column.
Step 2.
Add the digits in the tens position.
1 + 7 + 2 = 10. Write the 0 under the
tens position. The 1 is carried
over to the hundreds position.
Step 3.
Add the digits in the hundreds
position. 1 + 4 + 1 = 6.
Step 4.
Check by adding from the bottom up following the procedure stated
in steps 1 through 3.
c.
Subtraction.
A requirement for subtraction is indicated by the
symbol -. The answer to subtraction problems is called the difference. To
find the difference between two numbers, write the numbers in columns under
each other, as in addition, and proceed as shown in Example 2.
EXAMPLE 2.
Subtract 25 from 78.
Step 1.
Subtract the digits in the ones
position. 8 - 5 = 3.
Step 2.
Subtract the digits in the tens
position. 7 - 2 = 5.
3
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