1. Comparing and Ordering Rational Numbers
2-11
Comparing and Ordering Rational Numbers
Course 2
Warm Up
Problem of the Day
Lesson Presentation

2. Comparing and Ordering Rational Numbers
Course 2
2-11
Comparing and Ordering Rational Numbers
Warm Up
Write each mixed number as an improper fraction.
1. 1
3. 1 3 4 7 4 7 8 23 8
2. 2 5 6 11 6 1 12 97 12
4. 8

3. Learn to compare and order fractions and decimals.
Course 2
2-11
Comparing and Ordering Rational Numbers
Learn to compare and order fractions and decimals.

4. Insert Lesson Title Here
Course 2
2-11
Comparing and Ordering Rational Numbers
Insert Lesson Title Here
Vocabulary
rational number

5. Comparing and Ordering Rational Numbers
Course 2
2-11
Comparing and Ordering Rational Numbers 7 9 2 9
Which is greater, or ?
When two fractions have the same
denominator, just compare the numerators. 7 9 2 9
>
because 7 > 2. 7 9 = 2 9 =

6. Additional Example 1A: Comparing Fractions
Course 2
2-11
Comparing and Ordering Rational Numbers
Additional Example 1A: Comparing Fractions
Compare the fractions. Write < or >. 7 9 5 8
The LCM of the denominators 9 and 8 is 72. 7 9
7 · 8
9 · 8 56 72 =
Write equivalent fractions with 72 as the denominator. = 5 8
5 · 9
8 · 9 45 72 = =
Compare the numbers. 56 72
> 45
, and so 7 9
> 5 8

7. Additional Example 1B: Comparing Fractions
Course 2
2-11
Comparing and Ordering Rational Numbers
Additional Example 1B: Comparing Fractions
Compare the fractions. Write < or >. 2 5 3 7 – –
Cross Multiply the denominator
Of the first fraction by the
Numerator of the second fraction
Second, Cross multiply the
Denominator of the second fraction
By the numerator of the first fraction
Cross Multiply 2 5 3 7 – = –
-14 > -15
So -2/5 > -3/7

8. Comparing and Ordering Rational Numbers
Course 2
2-11
Comparing and Ordering Rational Numbers
Check It Out: Example 1A
Compare the fractions. Write < or >. 5 6 7 8 . 5 6
< 7 8

9. Comparing and Ordering Rational Numbers
Course 2
2-11
Comparing and Ordering Rational Numbers
Check It Out: Example 1B
Compare the fractions. Write < or >. 6 8 5 7 – –
Both fractions can be written with a denominator of 56. 6 8
–6 · 7
8 · 7
–42 56
Write equivalent fractions with common denominators.
Put the negative signs
in the numerators. – = = 5 7
–5 · 8
7 · 8
–40 56 – = = 42 56 40 56 6 8 5 7 –
< –
, and so – < –

10. Course 2
2-11
Comparing and Ordering Rational Numbers
To compare decimals, line up the decimal points and compare digits from left to right until you find the place where the digits are different.

11. Additional Example 2A: Comparing Decimals
Course 2
2-11
Comparing and Ordering Rational Numbers
Additional Example 2A: Comparing Decimals
Compare the decimals. Write < or >.
0.427
0.425
0.427 7
Line up the decimal points.
The tenths and hundredths are
the same.
0.425 5
Compare the thousandths:
7 > 5.
Since > 0.005, >

12. Additional Example 2B: Comparing Decimals
Course 2
2-11
Comparing and Ordering Rational Numbers
Additional Example 2B: Comparing Decimals
Compare the decimals. Write < or >.
0.73
0.734
0.73 = _
0.733… 3
Line up the decimal points.
The tenths and hundredths are
the same.
0.734 4
Compare the thousandths:
3 < 4.
Since 0.03 is < 0.04, 0.73 < _

13. Comparing and Ordering Rational Numbers
Course 2
2-11
Comparing and Ordering Rational Numbers
Check It Out: Example 2A
Compare the decimals. Write < or >.
0.535
0.538
0.535 5
Line up the decimal points.
The tenths and hundredths are
the same.
0.538 8
Compare the thousandths:
5 < 8.
Since < 0.008, <

14. Comparing and Ordering Rational Numbers
Course 2
2-11
Comparing and Ordering Rational Numbers
Check It Out: Example 2B
Compare the decimals. Write < or >.
0.3
0.334
0.33 = __
0.3333… 3
Line up the decimal points.
The tenths and hundredths are
the same.
0.334 4
Compare the thousandths:
3 < 4.
Since is < 0.004, 0.33 < __

15. Course 2
2-11
Comparing and Ordering Rational Numbers
A rational number is a number that can be written as a fraction with integers for its numerator and denominator. When rational numbers are written in a variety of forms, you can compare the numbers by writing them all in the same form.

16. Comparing and Ordering Rational Numbers
Course 2
2-11
Comparing and Ordering Rational Numbers
The values on a number line increase as you move from left to right.
Remember!

17. Additional Example 3: Ordering Fractions and Decimals
Course 2
2-11
Comparing and Ordering Rational Numbers
Additional Example 3: Ordering Fractions and Decimals 4 5
Order ,
0.93, and 0.9 from least to greatest.
Write as decimals with the same number of places. 4 5
= 0.80
0.93 = 0.93
0.9 = 0.90
Graph the numbers on a number line.
0.93
0.80 < 0.90 < 0.93
Compare the decimals in order. 4 5
From least to greatest, the numbers are , 0.9, 0.93.

18. Comparing and Ordering Rational Numbers
Course 2
2-11
Comparing and Ordering Rational Numbers
Check It Out: Example 3 3 5
Order , 0.84, and 0.7 from least to greatest.
Write as decimals with the same number of places. 3 5
= 0.60
0.84 = 0.84
0.7 = 0.70
Graph the numbers on a number line.
0.84
0.60 < 0.70 < 0.84
Compare the decimals in order. 3 5
From least to greatest, the numbers are , 0.7, 0.84.

19. Insert Lesson Title Here
Course 2
2-11
Comparing and Ordering Rational Numbers
Insert Lesson Title Here
Lesson Practice
Compare the fractions. Write > or <. 1.
Compare the decimals. Write < or >.
and 0.312 3 7 4 10 5 8 2 3 or
> 2.
< or
> 5 6
4. Order , 0.8, from least to greatest.
0.8, 0.826, 5 6