objective - to add and subtract fractions using the least common denominator. like termsunlike terms...
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Objective - To add and subtract fractions using the least common denominator.
Like terms Unlike terms
2 pens 3 pens+ 5 pens= 2 pens 3 rulers+
4 roses 8 roses+ 12 roses= 5 roses 7 daises+
5x 2x+ 7x= 6x 7y+
Only like things can be combined !
12
25
One-half Two-fifths
+
+
=
= ?
+
=
1225+
105
=
104
=
910or
Unlike things can’t be combined.
Therefore, change the fractions so that they have a common denominator.
Only like things can be combined !
55
22
Write a numerical expression that describes themodel, then evaluate the expression.
23
16
+
+
64
61 + =
56
11 2
2
Write a numerical expression that describes themodel, then evaluate the expression.
34
58 +
86
85
+ =118
+
3 18
11 2
2
Find the lowest common denominator for the given fractions.
2 31) 5 7
1 52) 4 12
7 53) 8 12
4 54) 9 6
3535 LCD 35
1212 LCD 12
2424 LCD 24
1818 LCD 18
Add or subtract.1 31) 2 7
147+ 14
6 =1314
7 33) 8 5
4035
4024 = 11
40
32) 251 12
10
10
1110
62
51
14) 652 13
15
15
6815
25
315
53
93
8415
77 2
2
22
55
55 8
8
33
55
15
Add or subtract.9 35) 5 10
1018+10
3 =2110
26) 134 5
15
101
12
1210
1515
25 15
1215
1315
22 1
1
55
33
Add or subtract.
7) 6 1
4 13
5
1 36 14 5
205
+ 20126 1
17720
3 2 18) 4 3 2
129
128
126
+
1712
6 12
1112
55 4
4
33 4
4 66
Find the perimeter of the figure below.
21 in.3
11 in.4
12 in.2
2 131 141 22
+
12
81
12
31
12
62
1712
4
5112
4 5512
44
33
66
Evaluate the expression below if 2a ,3
3 1b , c 1 .4 5
1) a b c
2 3 1 13 4 5
6040
6045
60121+
8560
7260
=1360
2020 15
15 1212