Adding & Subtracting Fractions Teacher Notes: Use this presentation to teach the steps for adding...
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Transcript of Adding & Subtracting Fractions Teacher Notes: Use this presentation to teach the steps for adding...
We need a common denominator to add
these fractions.
We need a common denominator to add
these fractions.
Use Prime factorization to find the Least Common Denominator (LCD)/ Least Common Multiple (LCM)
2 7
2*1*7*1=14
14 Is the Least Common Denominator (LCD)/Least Common Multiple (LCM)
x 2
x 2
X 7
x 7 7
6
7 + 6 = 13
13
We need a common denominator to add
these fractions.
5, 10, 15, 20, 25, 30, 35, 40, 45
7, 14, 21, 28, 35, 42, 49, 56, 63
x 7
x 7
X 5
x 5 15
7
15 + 7 = 22
22
Try These
A
F
EB
C
D
Answers On Next Slide
• Each click on the next slide reveals an answer.
• Check your papers.
• If you discover an incorrect answer, be able to explain your mistake.
Try These
A
F
EB
C
D1727
1920
109
4128
2621
1312
To change a mixed number into an improper fraction get MAD…Multiply – Add – Put over Denominator
4 ½
4 x 2 = 8
8 + 1 = 992
To change an improper fraction into a mixed number divide the numerator by the denominator; whatever is left over is the new numerator…keep the same denominator.
For Example: 11
411 divided 4 equals 2; there is 3 left over. 2
34
Change the following into Improper Fractions.
1. 3 ½
2. 5 5/8
3. 12 1/3
4. 15 ¾
Change the following into Mixed Numbers.
1. 40/13
2. 100/9
3. 4/3
4. 9/2
Change the following into Improper Fractions.
1. 3 ½ = 7/2
2. 5 5/8 = 45/8
3. 12 1/3 = 37/3
4. 15 ¾ = 63/4
Change the following into Mixed Numbers.
1. 40/13 = 3 1/13
2. 100/9 = 11 1/9
3. 4/3 = 1 1/3
4. 9/2 = 4 ½
5
6
2
3
=
=
=
=
6
6
5
6
4
6
To subtract fractions you must have a
common denominator!
Find the least common
multiple for 3 and 6. (In
this case, 6) Then multiply!
1
6This is your
answer!
6th Grade HomePage
1. ½ 2. 3 ¾
- ¼ - 1 ½
3. 4 1/5
- 1 1/2
1. ½ 2. 3 ¾
- ¼ - 1 ½
¼ 2 ¼
3. 4 1/5
- 1 1/2
2 7/10