subtracting

1. 2) Fill the spaces to make
equivalent fractions
1) Work out the following
mathematical anagrams
Task 1 – L4
3) What is the lowest common
multiple (LCM) of:
a) 3 and 4
Task 3 – L6
Task 2 – L5
lnieqtvaue
roumatern
taminoorend
Equivalent
Numerator
Denominator
b) 4 and 5
c) 5 and 6
a)
b)
c)
d)
12
20
30
3
18
36
70
a)
b)
c)

2. 22/05/2014
Adding and
subtracting fractions
Objective: I should be able to add and subtract
fractions. (L5-6/Grades E-D)
Keywords: numerator, denominator, simplify, equivalent
By the end of the lesson:
Must learn: to add and subtract fractions with a
common denominator. (5c/E-)
Should learn: to add and subtract fractions with
different denominators. (one change) (5a/E+)
Could learn: to add and subtract fractions with
different denominators.(two change) (6c/D-)
Real life link: You might need to add or subtract
distances involving fractions.

3. INTRODUCTION
Colour in the fractions and add them. What do you notice?
6
5
9
7
3
2
10
5
=
2
1
Must learn: to add and subtract fractions
with a common denominator. (5c/E-)

4. Fractions with different denominators
1
2
3
8
+
4
8
3
8
+ =
7
8
1
3
7
12
+ 4
12
7
12
+ = 11
12
Should learn: to add and subtract fractions with different
denominators. (one change) (5a/E+)
Can you work out what has happened to
get to this answer?

5. YOUR TURN (mini whiteboards)
1) 2)
5
2
+
10
1
= 21
16
-
7
3
=
4 + 1
10
=
10
5
10
4
+
10
1
21
16
-
21
9
16 - 9
21
=
21
7
=
3
1

6. A bit of work…
Task 1 – Bronze (L5c)
Task 2 – Silver (L5a)

7. MINI-PLENARY
TRUE FALSE
Stand Up Remain Seated
6
1
+
12
5
=
12
7
Q1

8. MINI-PLENARY
Stand Up Remain Seated
TRUE FALSE
7
4
+
7
2
=
14
6
Q2

9. MINI-PLENARY
Stand Up Remain Seated
TRUE FALSE
18
7
-
6
1
=
9
2
Q3

10. 2
3
1
4
+
+
=
11
12
20
15
16
12
12
9
8
6
4
3
Multiples of
3 and 4
12 is the LCM
8
12
3
12
Could learn: to add and subtract fractions with
different denominators.(two change) (6c/D-)

11. YOUR TURN (mini whiteboards)
1) 2)
2
1
+
3
1
=
5
4
-
4
1
=
3 + 2
6
=
6
5
6
3
+
6
2
20
16
-
20
5
16 - 5
20
=
20
11
15
10
12
8
9
6
6
4
3
2
Multiples of
2 and 3
6 is the LCM
25
20
20
16
15
12
10
8
5
4
Multiples of
4 and 5
20 is the LCM

12. A bit of work…
Task 1 – Bronze (L5c)
Task 2 – Silver (L5a)
Task 3 – Gold (L6c)

13. PLENARY – CELEBRITY TOP TRUMPS

14. PLENARY – CELEBRITY TOP TRUMPS

15. PLENARY – CELEBRITY TOP TRUMPS

16. 22/05/2014
Adding and
subtracting fractions
Objective: I should be able to add and subtract
fractions. (L5-6/Grades E-D)
Keywords: numerator, denominator, simplify, equivalent
By the end of the lesson:
Must learn: to add and subtract fractions with a
common denominator. (5c/E-)
Should learn: to add and subtract fractions with
different denominators. (one change) (5a/E+)
Could learn: to add and subtract fractions with
different denominators.(two change) (6c/D-)
Real life link: You might need to add or subtract
distances involving fractions.