CPM Homework Help : CC1 Problem 3-35

Find the following sums or differences.

Step 1 (a):
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 point, 0, 8.
Step 2 (a):
Add each column, starting at the right. Since $5 + 8 > 10$ , carry a 1 to the next column. Changes: Top row: 1 above the 3. Answer row: 1, 3, decimal point, 4, 3.
Answer (a):
$13.43$

$8.02 − 0. 64$
Help (b):
Set up the problem by aligning the decimal points. Unlike in part (a), you will do subtraction for each column.
More Help (b):
Notice that $2 < 4$ , 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.
$568.38 − 134.21$
Help (c):
Use parts (a) and (b) for help.
$0.29 + 0.92$
Hint (d):
Follow the steps from part (a). Remember that since $9 + 2 > 10$ , you will need to carry a $1$ to the next column