Business Mathematics Brief 12th Edition by Stanley Salzman ,Gary Clendenen, Charles Miller

تمرين 238

First use front-end rounding to estimate the answer and then subtract. (See Example.)

Estimating and Then Subtracting Decimals
First estimate using front-end rounding and then subtract.
(a)

(b)

SOLUTION
Attach zeros as needed and then subtract.
(a)

(b)