Post on 25-May-2015
description
Rename Before You Subtract
Mrs. YoungEMC 1
Subtract the fractions
6 - 1 47
Step 1:
• Rename 6. Use 7 for the denominator because the denominator in the problem is 7
6=
5+
77
6=
5+
1
6=
5 77
Step 1 continued…
• Our new subtraction problem is:
6-
1 47
=
= 1 4
7
5 77
Step 2:
• Subtract the fractions
1 47
5 77-
37
Step 3:
• Subtract the whole numbers.
1 47
5 77-
374
Step 4:
• Simplify the fraction to lowest terms, if possible.
• In this case, the answer is in lowest terms.
374
Subtract the fractions
5 - 1 56
16
Step 1:• Rename Use 6 for the
denominator5
16
=
4+
16
5=
5
=
4 66
16+
1 +
+
16
+
=
4 76
Step 1 continued
• Our new subtraction problem is:
5-
2 56
=
= 2 5
6
4 76
16
Step 2:
• Subtract the fractions
2 56
4 76-
26
Step 3:
• Subtract the whole numbers
2 56
4 76-
262
Step 4:
• Simplify the fraction to lowest terms, if possible.
262
In order to simplify the fraction, you must find the GCF of the numerator and the denominator.
Remember to list all of the factors:
2: 1, 2
6: 1, 2, 2, 6
GCF = 2
=÷
÷
22
13
2
Subtract the fractions
6 - 2 23
15
First things first!
• When we have unlike fractions we have to start by making like fractions (make equivalent fractions)!
6 - 2 23
15
15
- x 3
x 3
23
x 5
x 5= 3
15-
1015
Our new problem is:
6 - 21015
315
Step 1:• Rename using 15 as
the denominator6
315
=
5+
315
6 =
6
=
5 1515
315+
1 +
+
315
+
=
5 1815
315
Step 1 continued…
• Our new problem is:
6-
2 1015
=
= 2 10
15
5 181515
3
Step 2:
• Subtract the fractions
2 1015
5 1815-
815
Step 3:
• Subtract the whole numbers
2 1015
5 1815-
8153
Step 4:
• Simplify the fraction to lowest terms, if possible.
• In this case the fraction is in lowest terms.
8153
Subtract the fractions
4 - 2 23
16
First things first!
• When we have unlike fractions we have to start by making like fractions (make equivalent fractions)!
4 - 2 23
16
16
- x 1
x 1
23
x 2
x 2= 1
6-
46
Our new problem is:
4 - 2 46
16
Step 1:• Rename using 6 as the
denominator4
16
=
3+
16
4 =
4
=
3 66
16+
1 +
+
16
+
=
3 76
16
Step 1 continued…
• Our new problem is:
4-
2 23
=
= 2 4
6
3 766
1
Step 2:
• Subtract the fractions
2 46
3 76-
36
Step 3:
• Subtract the whole numbers
2 46
3 76-
361
Step 4:
• Simplify the fraction to lowest terms, if possible.
361 =÷
÷
33
12
1
In order to simplify the fraction, you must find the GCF of the numerator and the denominator.
Remember to list all of the factors:
1: 1, 3
6: 1, 2, 2, 6
GCF = 3
Your turn!
• Subtract
8 - 2 56
26
Try another!
• Subtract
4 - 3 15
18