Decimal numbers and whole numbers can be added together in a simple way. We can place a decimal point after the whole number and add zeros after the decimal point to make both the numbers like decimals. Both the numbers should be aligned as per their place value. For example, if we add 2 and 3.56, it will look like this:      3.56 + 2.00 ————   5.56   We are adding two zeros after the whole number 2, to convert  the whole number into a decimal.