Pre-Algebra Demystified

Math Note: Zeros can be affixed to the end of a decimal on the

right side of the decimal point. For example, 0.62 can be written as

0.620 or 0.6200. Likewise, the zeros can be dropped if they are at the

end of a decimal on the right side of the decimal point. For example,

0.3750 can be written as 0.375.

Addition of Decimals

In order to add two or more decimals, write the numbers in a column placing the

decimal points of each number in a vertical line. Add the numbers and place the

decimal point in the sum directly under the other decimal points above.

EXAMPLE

Add 3.2þ56.87þ381.561.

SOLUTION

3 : 200 Zeros are annexed to keep the columns straight

56 : 870

þ 381 : 561

441 : 631

EXAMPLE

Add 47.315þ126.2þ0.03.

SOLUTION

47 : 315

126 : 200

þ 0 : 030

173 : 545

PRACTICE

Add:

1. 0.63þ2.5þ8.332


2. 43.7þ126.21þ0.561


3. 29.1þ 32 þ627.52þ41.6


4. 18.003þ0.0006þ43.1


5. 92.7þ3.562þ4362.81

86 CHAPTER 5 Decimals