how can you add and subtract multi-digit decimals?

Question

adding and subtracting multi-digit decimals

Answer 1

You line up the decimal and do it just like a non-decimal. You may need to add zeroes. For example...

 

2.5 - 1.69 = 2.50 - 1.69 = 0.81

Answer 2

Write the numbers in a column so that the decimal points in each are in a vertical line.

Then add and subtract as you would integers.