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```MATHEMATICS FOR AIR CREW TRAINEES   5-6

Example: Subtract 765.328 from 843.1.
Solution:

843.100  EXTRA ZEROS
765.328
-------
Figure 3.

d. A problem in subtraction may be checked by adding the answer to the number directly above it. The sum should always be the number in the top row.
(1) Example: Check the answer to the example in c(1) above.
Solution:
843.100
-------     Check
77.772
-------
843.100
Figure 4.

(2) Units.- As in addition, care must be exercised to be sure that the units of the two quantities in a subtraction are the same.

e. Exercises.- In each pf the following exercises subtract the smaller number from the larger. The symbol used to indicate subtraction is the minus sign (-). Therefore, an expression such as "1,205.789-980.833=?" means "What is the remained when 980.833 is subtracted from 1,205.789?" The number following the minus sign is always subtracted from the number preceding the sign.

(2) 19.52-.78=18.74
(3) 760,591-674,892=?
(4) 73.44 cu. in.-8.7375 cu. in.=64.7025 cu. in.     Answer.
(5) 89.73-10.0045=?