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1. add and subtract rational numbers.
2. compare and order rational numbers.
SOL: none
ObjectiveThe student will be able to:
Designed by Skip Tyler, Varina High School
Find the sum.1) -2.304 + (-0.26)Line up the decimals and add (same signs).
-2.564
2)5
8
3
4
Get a common denominator and subtract.
5
8
6
8
1
8
Find the difference.
3)5 3
9 5
3
5
5
9
25
45
27
45
2
45
Change subtraction to adding the opposite.
Get a common denominator.
Subtract and keep sign of the larger number.
Find the difference.
4)1
2
6
7
61
2 7
7
14
12
14
5
14
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 solution6.5 – 9.3 = ?
Answer Now
1. -3.2
2. -2.8
3. 2.8
4. 3.2
Find the solution
Answer Now
2 1?
3 4
1
7
11
12
5
12
3
7
1. .
2.
3.
4.
A rational number is a number
that can be written as a fraction.How can these be written as a fraction?
3 = 3
1
23
4
11
4
Inequality Symbols
Symbol Meaning < is less than > is greater than ≠ is not equal to ≤ is less than or equal to ≥ is greater than or equal to = is equal to
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.32
88
33
88
4
11or
3
8
2) or convert the fraction to a decimal.0.363 < 0.375
4
11<
3
8
Which rational number is bigger?
1) Get a common denominator
2) or convert to a decimal1.75 < 1.83
7
4
11
6
7
4or
11
6
42
24< 44
24
Which symbol makes this true? 5
7__
3
41. <
2. >
3. =
Answer NowAnswer Now
Which symbol makes this true? -2
9__
-1
41. <
2. >
3. =
Answer NowAnswer Now