Download presentation
Presentation is loading. Please wait.
1
FRACTION REVIEW
2
FRACTION - a number that shows parts or pieces of a whole
3 numerator 4 denominator IMPROPER FRACTION - when the number on top is bigger than the number on the bottom. 7 4 MIXED NUMBER - a number that shows wholes and fractions 1 3 4
3
Adding Fractions 3 2 + Hmmm… 4 5 Step 1: Find a common denominator
4
+ 3 2 4 5 Adding Fractions Step 1: Find a common denominator
The LCM of 4 and 5 is 20. 4 5 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator
5
+ 3 2 4 5 Adding Fractions 5 x x 4 Step 1: Find a common denominator
The LCM of 4 and 5 is 20. 4 5 5 x x 4 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator
6
What you do to the bottom you have to do to the top.
Adding Fractions 3 2 5 x x 4 What you do to the bottom you have to do to the top. + 4 5 5 x x 4 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator
7
What you do to the bottom you have to do to the top.
Adding Fractions 15 8 What you do to the bottom you have to do to the top. + 20 20 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator Step 3: Add the numerators. Keep the same denominator.
8
+ 15 8 20 20 Adding Fractions Step 1: Find a common denominator
= 23 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator Step 3: Add the numerators. Keep the same denominator.
9
Adding Fractions 15 8 23 + = 20 20 20 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator Step 3: Add the numerators. Keep the same denominator.
10
Change impropers to mixed #s
Adding Fractions 15 8 23 + = Change impropers to mixed #s 20 20 20 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator Step 3: Add the numerators. Keep the same denominator. Step 4: Simplify if necessary
11
Adding Fractions 15 8 23 1 3 20 can go into 23 1 time. + = = 20 20 20 20 There is a remainder of 3. Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator Step 3: Add the numerators. Keep the same denominator. Step 4: Simplify if necessary
12
Subtracting Fractions is almost like adding.
13
Subtracting Fractions
1 1 - 2 6 Hmmm… Step 1: Find a common denominator
14
Subtracting Fractions
1 1 - The LCM for 2 and 6 is 12 2 6 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator
15
Subtracting Fractions
6 2 - The LCM for 2 and 6 is 12 12 12 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator Step 3: Subtract the numerators. Keep the same denominator.
16
Subtracting Fractions
6 2 4 - = 12 12 12 6 - 2 = 4 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator Step 3: Subtract the numerators. Keep the same denominator.
17
Subtracting Fractions
6 2 4 / 4 1 3 - = = 4 and 12 share a common factor of 4 12 12 12 Step 1: Find a common denominator Step 2: Find equivalent fractions with the common denominator Step 3: Subtract the numerators. Keep the same denominator. Step 4: Simplify if necessary
18
Multiplying Fractions is way easier than adding and subtracting.
19
Multiplying Fractions
4 3 Ummm… I don’t know. x = 7 6 YOU DO NOT NEED A COMMON DENOMINATOR
20
Multiplying Fractions
4 3 Oh good! x = 7 6 YOU DO NOT NEED A COMMON DENOMINATOR
21
Multiplying Fractions
4 3 Oh good! x = 7 6 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Multiply the numerators.
22
Multiplying Fractions
4 3 12 4 x 3 = 12 x = 7 6 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Multiply the numerators. Step 2: Multiply the denominators
23
Multiplying Fractions
4 3 12 7 x 6 = 42 x = 7 6 42 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Multiply the numerators. Step 2: Multiply the denominators Step 3: Simplify if necessary
24
Multiplying Fractions
4 3 12 6 / 2 7 The GCF for 12 and 42 is 6 x = = 7 6 42 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Multiply the numerators. Step 2: Multiply the denominators Step 3: Simplify if necessary
25
Dividing Fractions is easy if you remember one little thing.
26
Do I need a common denominator?
Dividing Fractions Do I need a common denominator? 1 2 / 2 3 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Find the reciprocal of the second fraction
27
/ 1 2 2 3 Dividing Fractions YOU DO NOT NEED A COMMON DENOMINATOR
FLIP THE SECOND ONE! / 2 3 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Find the reciprocal of the second fraction
28
/ 1 3 2 2 Dividing Fractions YOU DO NOT NEED A COMMON DENOMINATOR
FLIP THE SECOND ONE! / 2 2 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Find the reciprocal of the second fraction Step 2: Change division to multiplication
29
/ 1 3 / to X 2 2 Dividing Fractions
YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Find the reciprocal of the second fraction Step 2: Change division to multiplication
30
x 1 3 / to X 2 2 Dividing Fractions
YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Find the reciprocal of the second fraction Step 2: Change division to multiplication Step 3: Multiply and simplify if necessary
31
Dividing Fractions 1 x 3 and 2 x 2 1 3 3 x = 2 2 4 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Find the reciprocal of the second fraction Step 2: Change division to multiplication Step 3: Multiply and simplify if necessary
32
Dividing Fractions 1 3 3 x EASY!!! = 2 2 4 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Find the reciprocal of the second fraction Step 2: Change division to multiplication Step 3: Multiply and simplify if necessary
33
Special Situations Adding and subtracting mixed numbers: just add or subtract fractions, then wholes. Subtracting mixed numbers when the first fraction part is smaller than the second: change to improper fractions. Multiplying and dividing mixed numbers and wholes: change to improper fractions
34
Get into partner groups
35
Adding Fractions
36
Subtracting Fractions
37
Multiplying Fractions
38
Dividing Fractions
39
Multiplying or Dividing mixed numbers
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.