Adding and subtracting fractions
Describe what mathematical information the
pictures are telling you about fractions. Try to
connect the pictures
Identify and explain jobs in
which your fraction knowledge
would be needed.
Remember you need a common
denominator to add and subtract fractions
2
5
x3
+
1
3
x5
6
5
11
=
+
=
15 15 15
1)
1
3
+
10
10
2)
7
9
3)
3
5
+6=
4)
5)
6)
5
8
+ 10 =
−9=
7)
8
9
− =
1
8)
4
7
+6=
3
4
− =
3
5
6
−3=
2
1
2
+4=
3
=
9)
3
2
5
1)
1
2
+ +
2
5
3
10
2)
7
9
− +
1
3
5
6
2
1
1
1
3
8
1
10) 2 + 8 =
3) 3 5 + 1 3
3
2
4) 1 4 − 5
Adding and Subtracting Fractions
Describe what mathematical information the
pictures are telling you about fractions. Try to
connect the pictures
Identify and explain jobs in
which your fraction knowledge
would be needed.
Remember you need a common
denominator to add and subtract fractions
2
5
x3
+
1
3
x5
6
5
11
=
+
=
15 15 15
1)
2)
1
10
7
9
+
3
10
=
3
9
− =
4
10
=
2
5
6)
+ =
1
6
18
30
+
5
30
=
23
30
4)
5
6
− =
2
3
15
18
−
12
18
=
3
18
1
2
+ = + =
𝑜𝑟
=
5 4 1
𝑜𝑟 − =
6 6 6
4
8
6
8
10
8
1
6
2
1
25
40
2
5
=
+
40
8)
4
7
+ =
9)
3
4
−
3
8
1
2
+
1
6
50
80
12
− =
= 1 = 1 10)
8
4
2 3 5
1
+ = =1
4 4 4
4
3
10
8
9
7)
3
5
3
4
+
𝑜𝑟
4
9
3)
5)
5
8
+
=
24
80
=
74
80
18
45
=
22
45
7
42
=
37
40
40
45
−
24
42
+
=
37
40
31
42
24
12
12
3
= − = =
32
32
32
8
6 3 3
𝑜𝑟 − =
8 8 8
1
8
2
10
5
= + = =
8
16
16
16
8
4 1 5
𝑜𝑟 + =
8 8 8
1)
1
2
+ +
2
5
3
=
10
7
9
− + =
1
3
5
6
5
4
3
12 6
+
+
=
=
10 10 10 10 5
2)
14 6 15 23
5
−
+
=
=1
18 18 18 18
18
2
1
3) 3 5 + 1 3=
4)
17 4 51 20 71
11
+ =
+
=
=4
5 3 15 15 15
15
3
2
1 − =
4
5
7 2 35 8
27
7
− =
−
=
=1
4 5 20 20 20
20