Suppose you want to multiply 25.3 by 0.46.
Pretend that you’re multiplying numbers without decimal points:
Now you need to find out where the decimal point goes.
To do this, notice that 25.3 has one digit after the decimal point, and that 0.46 has two digits after the decimal point.
Place the decimal point in the answer so that it has three digits after the decimal point.
Suppose you want to add 12.96, 3.5 and 8.
Line up the decimal points.
Begin adding from the right-hand column. Treat the blank spaces after 3.5 and 8 as zeroes.
Add first column.
Continue to the left.
Complete the problem column by column, and at the end, put the decimal point directly below the others. Continue reading Adding Decimals