#### Answer

A. $84.23 - 26.982 = 57.248$
B. $90 - 0.19 = 89.91$

#### Work Step by Step

A.
84.230
-26.982
_______
57.248
B.
90.00
-0.19
_______
89.81
When subtracting, if the digit below is greater than the digit on top, you must subtract one from the digit to the left and add ten to the lesser digit on top of the greater digit. For example, in A, the digit in the thousandths place is zero which is less than the digit under it, 2. As a result, I crossed out 0 and added 10 while also subtracting 1 from 3, the digit to the left. 10-2 = 8 which is why the digit in the thousandths place of the difference is 8. The digit in the hundredths place of the number 84.230 is now 2, (remember that we subtracted 1 to add 10 to 0). This is less than 8. As a result, we add 10, making it 12. 12 - 8 = 4, which is why the digit in the hundredths place of the difference is 4. We also subtracted one from the top digit in the tenths place, 2. Continue this process until it is no longer necessary.