Download Maths Evening Powerpoint

Maths Evening
Powerpoint
Maths is like true
love, a simple idea
but can get
complicated!
This evening I will…
• Inform you how and why we teach the four
operations (addition, subtraction, multiplication
and division) at the Preston Primary so that you
can help your child in their maths activities.
Addition
Your child will learn…
• How to add effectively.
Use of the hundred square
Use of place value cards
23 = 20 + 3
Use of place value cards for
addition.
Rules for Expanded
Column Addition
A few tips to help you out!
Expanded column addition
135
+ 42
7 (5 + 2)
70 ( 30 + 40)
100 ( 100 + 0)
177
Column addition using carrying
348
245
+ 348
245
3
1
+ 348
245
593
+
Subtraction
Your child will learn…
• How to subtract.
Subtraction
• Children start by recording subtraction using
calculations with pictures. This helps them to
develop a mental picture of the number system in
their head.
Use of the hundred square
Find ten more and ten less than a given number
Subtraction
In Key Stage 1 children then use number lines (counting on OR
backwards) practically and written to solve calculations. Also
known as finding the difference. Number lines are powerful
images to help children develop mental methods for subtraction.
In Key Stage1…
• We teach the children to ‘count on’ on a number
line when there is a small difference between
numbers.
• For example: 82 - 78
+2
78
+2
80
82
In Key Stage 2 children:
•Again, use the number line to count up to the nearest
10 and count on.
45 – 16 =
16 → 20 → 30 → 40 → 45 = 4 + 10 + 10 + 5 = 29
10
4
16
20
10
30
Gradually you need less jumps.
5
40
45
Pencil and paper calculations
The numbers on the top row are partitioned (split up into tens
and ones) to make the subtraction possible.
.
Subtraction – decomposition
Many parents learnt this method mechanically using words like ‘borrowing’
and ‘paying back’. We now know children need a solid foundation using
previous methods to understand this ‘code’.
4 12 1
533
-187
346
Can get ‘messy’ if performing
a calculation like 2004 – 997.
Mental methods are quicker!
Multiplication
Your child will learn…
• How to multiply.
It’s all about Groups
Multiplication means
groups of
e.g. 3 x 2 means 3 groups of 2
Learn all tables by end of Year
5!
Multiplying by 10
When you multiply by 10,
all the digits move 1
place to the left and a
0 is added.
X 10
2
3
20
30
200
300
2000 3000
X 10
Multiplying by partitioning
45 x 6
40 x 6 =240
5x 6=30
240+30=270
This moves on to the grid method.
23 x 5 = ?
Partition the number larger number to make it
easier for us to work out the answer.
23 = 20 + 3
Now transfer all the
information we have onto
the grid.
x
20
3
5
Firstly, times the digit
on the top row by one
of the numbers at the
side. Write the answer
on the grid.
Repeat for the other
number.
Finally, add these two new
numbers together.
x
5
20 100
3
15
= 115
37 x 86
30
80
6
7 x
2400 560
42
180
2580 +
602
3182
1
2580
+
602
Division
Your child will learn…
• How to divide.
Early division begins with
sharing in practical activities.
Linking Multiplication
and Division
4 x 3 = 12
12 ÷ 3 = 4
3 x 4 = 12
12 ÷ 4 = 3
20 ÷ 4 =
Children need to recognise that it can mean
20 shared by 4
How many lots of 4 in 20?
Link to multiplication facts
Using a empty number line to divide
56 ÷ 4 =
56 ÷ 4 = 14
Bus stop method
• Try to use the 4 operations effectively in a range of
real life situations (problem solving). Make maths
real and fun for your children. Enjoy!
Thank you for reading
• Recommended reading:
Maths for Mums and Dads
by Rob Eastaway and Mike Askew
• Should you have any questions or queries, please
get in touch with Mrs Brown,
• Numeracy Co-ordinator.