lesson 5-8 pages 227-231 comparing and ordering rational numbers lesson check 5-7
TRANSCRIPT
Lesson 5-8 Pages 227-231
Comparing and Ordering Rational
NumbersLesson Check 5-7
What you will learn!
How to compare and order fractions, decimals,
and percents.
Common denominatorCommon denominator
Least common denominator (LCD)Least common denominator (LCD)
Rational numbersRational numbers
What you really need to know!
To compare fractions, rewrite them so they have the same denominator. The least common denominator (LCD) of two fractions is the LCM of their denominators.
What you really need to know!
Another way to compare fractions is to express them as decimals. Then compare the decimals.
Rational Numbers
5.2
0.8
3
25
2
1
-1.444…
Integers
-6 -10
What you really need to know!
Whole Numbers
8 131
Find the LCD:
9
7
6
5and
18
15
3
3
6
5
18
14
2
2
9
7
Find the LCD:
7
1
4
3and
28
21
7
7
4
3
28
4
4
4
7
1
Example 1:
Joe and his younger brother both had a math test last Friday. Joe scored 48 points out of 60 and his brother scored 55 points out of 75. Who got the better score?
Example 1:
%808.0604860
48
%7337.0755575
55
Joe had the better score.
Example 2:
According to the Pet Food Manufacturer’s Association, 11 out of 25 people own large dogs and 13 out of 50 own medium dogs. Do more people own large or medium dogs?
Example 2:
%4450
22
225
211
25
11
%2650
13
150
113
50
13
Large!
Example 3:
greatest. least to from
72% and 0.6, ,10
7Order
7.010710
7
6.06.0 72.010072%72
72% ,10
7 0.6,
0
0
Example 4:
Find the number that is rational.
AA 0.12345…0.12345…BB 0.123123…0.123123…CC DD 0.10203…0.10203…
AA 0.12345…0.12345…BB 0.123123…0.123123…CC DD 0.10203…0.10203…
Natural Numbers
Whole Numbers
Integers Rational Numbers
5
5 5 5 500
0
0
-7
-7 -7
4.5
4.5
3/4
3/4
Page 229
Guided Practice
#’s 3-12
Pages 227-229 with someone at home and study
examples!
Read:
Homework: Page 230-231
#’s 14-50 even
#’s 54, 55, 58-64
Lesson Check Ch 5
Page
576
Lesson 5-8
Lesson Check Ch 5
Study Guide and Review
Pages
232-234
#’s 1-68(Odd answers in back of book)
Prepare for Test!
Page
235
#’s 1-20 Lesson Check Ch 5Practice Test Answers
Lesson Check Ch 5 V2
Practice Test Answers
Prepare for Test!
Pages
236-237
#’s 1-17