Transcript Addition - Bridlewood Primary School

Bridlewood Primary School
Calculation and Croissant
Parent Workshop
17th October 2012
Aims
To explain how we teach your children +,
-, x and ÷.
To give you ideas of how you can help your
children at home.
How did you solve these?
• 157+65=
• 245-152=
• 46x22=
• 154÷7=
Maths lessons
• Emphasis on mental calculation
• Children are encouraged to work
mentally, using jottings to support their
thinking
• Encouraged to use more formal written
methods only for calculations they can
not solve in their heads
• Maths through problem solving
By the end of Key Stage 2 we want
your children to…
• Recall key number facts e.g all +/- facts for
each number to 10, times tables, number
bonds
• Have good understanding of the 4
operations
• Have an efficient, reliable method of
calculation for each operation
• Apply what they know
• Use a calculator effectively
Addition
Addition
Adding Practically
Addition
Encouraging children
to put the biggest
number in their head
and count on with fingers.
5 +3
3+5
8
Addition
Use of a number line
6+5=
1
2
3
4
5
6
7
8
9
10
11
12
13
Use of a 100 square
34+12=
Partitioning
Addition by partitioning
132+124=
Your Turn 56+43=
Addition using a blank number line
45+34=
Your Turn!
85+44
Addition
The Extended Method
348
+ 21
9
60
300
369
Your turn - 266+233=
Addition- Standard Written Method
6648+1486=
We will extend further with larger numbers and decimals
Subtraction
Subtraction
Taking away practically.
3-2=
Use of a number line/100 square
12-6=6
1
2
3
4
5
6
7
8
9
10
11
12
13
Subtraction using a blank number
line
62 – 26 =
If the numbers are far apart, count back.
If they are close together, count on.
Your turn! 78-44=
Subtraction
676 – 34 =
600+ 70 + 6
30 + 4
600 + 40 + 2
For this problem, you could also use this method:
654- 96
+4
96
+500
100
+54
600
654
500+54+4=558
Subtraction- Standard Written Method
6467-2684=
By year 6, the children will mostly be
using the traditional borrowing method.
Multiplication
Reception
First of all, count in 2’s and then repeat by counting in 10’s.
Multiplication- repeated addition
3x5=
(3 groups of 5)
xx
xx
x
5
xx
xx
x
+ 5
xx
xx
x
+
5= 15
Times tables
• By end of Year 2 children should know
x2,x5,x10
• Practise counting in 2’s, 3’s, 4’s, 5’s, 10’s
• Matching pairs (question on one card,
answer on another)
• Musical times tables
Multiplication using a blank number line
4x3=
Your turn - 6x8=
Multiplication by partitioning
32x3=
Mentally solve this calculation by:
30 x 3 = 90
2x3=6
90 + 6 = 96
Your turn - 45x6=
Grid Method
32x7=
33x22=
Your turn! - 34x23=
Multiplication-Standard Written Method
352x27=
352
x27
2464 (352x7)
31
7040 (352x20)
1
9504
1
Division
÷
Reception
• Sharing items equally into given groups
• 6÷2=
Sharing
Division
The children are sharing out into a known number of
groups but how many in each group is unknown,
12÷3=
÷
12 apples are shared into 3 baskets.
How many apples are in each basket?
Division – Y2
÷
Division using a blank number line
25÷5= 5
(How many groups of 5 are there in 25?)
÷
Your turn - 24÷6
Division- Chunking
96÷6=
(How many groups of 6 are there in 96?)
Fact Box
1x6=6
2x6=12
5x6=30
10x6=60
20x6=120
50x6= 300
100x6=600
522÷9= 58
Your Turn!
Fact Box
1 x 9 = 9
2 x 9 = 18
5 x 9 = 45
10 x 9 = 90
20 x 9 = 180
50 x 9 = 450
100 x 9 = 900
Long Division
• 105 ÷ 5
How you can support your child
• Look for and talk about numbers in the
environment
• Play games
• Shopping
• Counting on/back
• Number bonds
• Doubles/Halves
• Times tables
• Division facts
Websites
• http://nrich.maths.org/public/
• http://www.bbc.co.uk/schools/ks2bitesize/maths/
number.shtml
• http://www.teachingtime.co.uk/
• http://www.teachingtables.co.uk
• http://www.bbc.co.uk/schools/laac/menu.shtml
• http://www.woodlandsjunior.kent.sch.uk/interactive/literacy/index.htm
• http://www.coxhoe.durham.sch.uk/