Objective�The student will be able to:

1. add and subtract rational numbers.
2. compare and order rational numbers.

SOL: none

Designed by Skip Tyler, Varina High School

Revised by Mr. Montenegro

Find the sum.�1) -2.304 + (-0.26)�

Line up the decimals and add (same signs).

-2.564

Get a common denominator and subtract.

Find the difference.

3)

Change subtraction to adding the opposite.

Get a common denominator.

Subtract and keep sign of the larger number.

Find the difference.

Get a common denominator and subtract.

Change subtraction to adding the opposite.

Substitute for y: 6.32 - (-3.42)

6.32 + 3.42

9.74

5) Solve 6.32 – y if y = -3.42

Find the solution�6.5 – 9.3 = ?

1. -3.2
2. -2.8
3. 2.8
4. 3.2

Find the solution

1. .

A rational number is a number

that can be written as a fraction.

How can these be written as a fraction?

​

3 =

Inequality Symbols

Ordering Rational Numbers

2 ways to order from least to greatest

1. Get a common denominator
2. Change the fractions to decimals � (numerator ÷ demoninator)

Which rational number is bigger?

1) Get a common denominator.

2) or convert the fraction to a decimal.

0.363 < 0.375

Which rational number is bigger?

1. Get a common denominator

​

​

• or convert to a decimal

1.75 < 1.83

Which symbol makes this true?

1. <
2. >
3. =

Which symbol makes this true?

1. <
2. >
3. =

-2

9

__

-1

4