Find the following sums or differences. .
Align the terms at their decimal points. Numbers arranged in 2 rows of 5 columns as follows: Top row: 1, 2, decimal, 3, 5. Bottom row: blank, 1, decimal, 0, 8.
Add each column, starting at the right. Since
, carry a 1 to the next column. Changes: Top row: 1 above the 3. Answer row: 1, 3, decimal, 4, 3.
Set up the problem by aligning the decimal points. Unlike in part (a), you will do subtraction for each column.
, so you will need to ''borrow'' from the columns to the left. So a tenth was “borrowed” from 8.0 so that 4 would be subtracted from 12 instead of 2. That meant the 0.6 would be subtracted from 7.9.
Use parts (a) and (b) for help.
Follow the steps from part (a). Remember that since
, you will need to carry a to the next column