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 childrento put the biggestnumber in their headand count on with fingers.
5 + 3
8
3 + 5
Use of a number line
1 2 3 4 5 6 7 8 9 10 11 12 13
Addition
6+5=
Use of a 100 square
34+12=
Partitioning
Addition by partitioning132+124=
Your Turn 56+43=
Addition using a blank number line
45+34=
Your Turn! 85+44
Addition
348+ 21 9 60 300 369
The Extended Method
Your turn - 266+233=
Addition- Standard Written Method
6648+1486=
We will extend further with larger numbers and decimals
Subtraction
Subtraction
3-2=
Taking away practically.
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 =
Your turn! 78-44=
If the numbers are far apart, count back. If they are close together, count on.
Subtraction676 – 34 =
For this problem, you could also use this method:
654- 96
96 100 600 654
+4 +500 +54
500+54+4=558
600+ 70 + 6 30 + 4
600 + 40 + 2
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
xxxxx
3x5= (3 groups of 5)
xxxxx
xxxxx
5 + 5 + 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 2 x 3 = 690 + 6 = 96
Your turn - 45x6=
Grid Method32x7=
33x22=
Your turn! - 34x23=
Multiplication-Standard Written Method
352x27=
352 x272464 (352x7)
7040 (352x20)
9504
13
1
1
Division ÷
Reception
• Sharing items equally into given groups
• 6÷2=
DivisionSharingThe children are sharing out into a known number ofgroups 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= Fact Box1x6=62x6=125x6=3010x6=6020x6=12050x6= 300100x6=600
(How many groups of 6 are there in 96?)
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
522÷9=58
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.woodlands-junior.kent.sch.uk/
interactive/literacy/index.htm• http://www.coxhoe.durham.sch.uk/