Transcript PowerPoint - Bridlewood Primary School

Bridlewood Primary School
Maths Parent Workshop
Wednesday 10th November 2010
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 eg number bonds
to 10 and associated bonds to 100.
• 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.
3+5
+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
45 + 34 =
Addition by partitioning
132+124=
Your Turn 56+43=
Addition using a blank number line
45+34=
185+44
=
Your Turn!
85+44
Addition
The Extended Method
425+48=
Your turn - 266+233=
Addition- Standard Written Method
6648+1486=
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 =
Your turn! 78-44=
Subtraction
654 – 96 =
654
- 96
4 (to make 100)
500 (to make 600)
54 (to make 654)
558
Add on to 96 the number that makes 100
Add on to 100 the number that makes 600
Add on to 600 the number that makes 654
Relates to the number line method as follows
+4
96
+500
100
+54
600
654
500+54+4=558
Subtraction- Standard Written Method
553-241= 500+50+3
200+40+1
300+10+2 = 312
40+13
553-248= 500+50+3
200+40+8
300+0+ 5= 305
Multiplication
Multiplication- repeated addition
3x5=
(3 groups of 5)
xx
xx
x
5
xx
xx
x
+ 5
xx
xx
x
+
5= 15
Multiplication using a blank number line
4x3=
Your turn - 6x8=
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 by partitioning
32x3=
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
÷
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?
Grouping
Division
÷
It is known how many are in a group but the
number of groups is not known.
12÷3=
How many groups of 3 are there in 12?
There are 12 apples. How many horses
will get 3?
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
Your Turn!
100÷7=
Fact Box
1 x 7 = 7
2 x 7 = 14
5 x 7 = 35
10 x 7 = 70
20 x 7 = 140
50 x 7 = 350
100 x 7 = 700
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/