Transcript KS1 Slides for workshop

KS1 Maths
Workshop
Counting in
2s, 5s and 10s
Addition
add
and
How many more?
plus
double
more than
altogether
increase
sum
total
Number bonds to 10
eg, 10 + 0 = 10, 9+ 1 = 10….
Addition facts for numbers up to 10
6+0=6; 5+1=6; 4+2=6…
Numbers bonds to 20  19+1; 18+2; 17
+3
All addition facts to 11, 12 , 13 …20
Multiples of 10 and multiples of 5 which
add up to 100…
70 + 30, 45 + 55 etc
Doubles and near doubles
6 + 6 = 12, 6 + 7 = 13, 6 + 5 = 11
35 + 35 = 70, 35 + 36 = 71 etc
Writing operations and solving problems using
‘informal methods’
17 + 5 = ?
Firstly, encourage mental strategies
(starting with the higher number, counting on, looking for
pairs which make 10, verbal discussion about the method
used to get an answer, checking!)
On Monday morning, Bailey get 4 housepoints,
Marconi get 3, Albright get 6 and Mustad get 7. What
is the total number of housepoints given?
Simple, informal jottings… use of a number line
17 + 5 = ?
X
17
18
19
20
21
22
23
24
PLACE VALUE – Tens and Units…
25
293
2 Tens and 5 Units
2 Hundreds, 9 Tens and 3
Units
What is the value of each underlined digit in the following
numbers?
28
158
49
317
84
708
60
965
Can you add single units to
any number?
Can you add multiples of 10
to any number
Can you add multiples of 100
to any number?
Being able to split a number into Hundreds, Tens and Units is
VERY IMPORTANT!
This is called
‘partitioning’ and ‘recombining’
28  2 tens and 8 units
28 =
20 + 8
49  4 tens and 9 units
49 =
384 
616 
902 
40 + 9
7 tens and 3 units =
6 tens and 2 units
3 hundreds and 7 units =
200 + 50 + 6 =
500 + 10 + 9 =
Using a ‘mental’ or empty numberline
24 + 47=
47 + 24 =
47 + (20 + 4) =
+10
+10
+1
+1
+1
+1
X
47
57
67
68
69
70
71
Getting quicker…
24 + 47=
47 + 24 =
47 + (20 + 4) =
+20
+4
X
47
67
71
A different strategy…
26 + 42 =
Add the tens together and then add the units together
2 6
+
4 2
(20 + 40) + (6 + 2) =
60 + 8 =
68
subtract
minus
How many fewer
is…..than….?
take away
difference
between
decrease
leave
reduce
How much
less is..?
Number bonds up to 10
Eg, 3 - 0 = 3, 5 - 1 = 4….
10 - 0 = 10, 9 - 1 = 8
Numbers bonds up to 20
All bonds to 11, 12 , 13 …20
Multiples of 10 up to 100…
70 - 30, 100 – 20 = 80 etc
It is important that children move away from the language of ‘take away’ in
Key Stage 1 and move towards ‘subtraction’.
Counting back…
…on a numberline
Simple, informal jottings… use of a number line
7-5=?
2
7
-5
At Key Stage 1, children will count back on the
numberline to find the answer.
The link between addition
and subtraction
multiply
times
arrays
lots of
double
multiples
repeated addition
double
product
scale up
Can you draw an
image to show …
4x2
4x2
4 sets of 2
4x2
4 lots of 2
2+2+2+2
4x2
4 lots of 2
0
2 +
2 +
2
4
2 +
6
2
8
4x2
4 times 2
4x2
4 two times
4+4
4x2
4 multiplied by 2
ARRAYS
Fast, mental recall of
times tables is
really,
really,
really
IMPORTANT!
divide
share
group
remainders
decimals
divisor
fractions
12  3 = 4
Sharing
There are three children and 12 cakes. How many can
they each have, if I share them out equally?
Sharing 12 things equally into 3 piles.
How many in each
12  3 = 4
Grouping
There are 12 cakes. How many children can have three
each?
(How many threes are there in 12?)
Language and division
• The  sign represents both the sharing and
grouping aspects of division
• Encourage the children to read this as
‘divided by’ rather than ‘shared by’,
• Even easier – ‘HOW MANY!’
4 x 3 = 12
12 ÷ 3 = 4
3 x 4 = 12
12 ÷ 4 = 3
Thank you
Please feel free to go and visit the year group stands
to see a range of resources which can be used to
support the methods discussed 