Fundamentals of Math

Fundamentals of Mathematics

Practice 2.2.2

Directions: Identify the sum or difference in each expression. Simplify your results.

1. 1 3

+ 1 3

2. 30 32

− 2

32

3 12

− 1

3. 5 7

+ 3 7

4.

12

9 28

+ 8

6. 2 5

− 2

5.

14

40

7. 20 70

+ 3 5

8. 1 3

− 2

30

8 12

+ 1 4

10. 3 5

− 2

9.

45

Answer Key on Page 118

2.3 Decimals By now you already know decimals are numbers that contain a "decimal point," such as 1.3 or 2.075 - the number to the left of the decimal point is the whole number, and the digits to the right are a type of fractional number. For example, the decimal 0.5 represents the fraction 5 10 or 1 2 . Decimal fractions always have a denominator based on a power of 10. How to Convert a Fraction to a Decimal If you need to turn a fraction into a decimal, then the easiest method is to use a calculator to perform the division. Calculators, of course, are not always an option and that instance you will need to do long division. To see a refresher of long division with decimals refer to the example below.

Example 2.3.1

78 15

Step 1:

The denominator becomes the divisor the numerator the dividend.

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