Page 80 - Math Course 1 (Book 1)

Unlike Fractions

REAL WORLD EXAMPLE
Jogging

17
11
Juyong jogged three days this week for a total of miles. If she
20
1
1
4
3
jogged miles and miles another, how many miles did she jog
2 4
on the third day?
Explore You know the total distance Juyong jogged and the distances on two days.
17
Plan Add the known distance and subtract the sum from . Estimate your answer.
11
20
(
1 1
11 - 3 ( + 4 = 4
2 2
Solve - 3 1 + 4 1 =3 2 + 4 1 = 7 3 Simplify.
2 4 4 4 4
Rename the fractions with LCD, 4.

17 3 17 15
3
11 - 7 =11 - 7 Rename with the LCD, 20.
7
20 4 20 20 4
=4 2 or 4 1 Simplify.
20 10

1 Since is close to 4, the answer
1
4
Juyong jogged miles on 4
Answer 10 Examine 10
the third day. is reasonable.
Your Turn!

Subtract Fractions and Mixed Numbers
11 2 5 1
Find - Write in simplest form. Find 3 - 2 Write in simplest form.
12 9 6 8

2 17
A. A. 1
3 24
25 13
B. B. 1
36 16

5 11
C. 1 C. 2
36 24
23
D. 3 D. 5
24

Answer Answer

72