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Bdtbmetic.
Addition.
All quantities to be added must be of the same unit; we can
not add 3 feet + 8 inches + 2 meters, without first reducing
these three terms either to feet, inches or meters. The same
also with numbers. Units must be added to units, tens to tens,
hundreds to hundreds, etc.
Example.
318 -f 5 + 38 + 10 + 115 = 486
Solution : 318
5
38
10
115
486 = Sum.
Subtraction.
Two quantities to be subtracted must be of the same
unit.
In subtraction, the same as in addition, the units are
placed under each other, and units are subtracted from units,
tens from tens, hundreds from hundreds, etc.
Example.
2543 — 1828 == 715
Solution: 2543 . . Minuend.
1828 . Subtrahend
715 . . Difference.
Subtrahend -f Difference = Minuend.
(5)
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