Transcript 8 + 4 = Empty number lines - St Martin de Porres Catholic Primary

Welcome to the Year 2
Maths Workshop
2nd December 2014
Aims:
•Provide you with support to help your
child with their maths skills.
•To discuss the importance of having a
good understanding key instant recall
facts.
•To show you how we teach the 4
operations at St. Martin’s.
Key instant recall facts
(KIRFs)?
 Instant recall is one of the most important parts of
learning mathematics. It gives children a bank of
knowledge from which they can draw to help them
when working with maths in a range of
situations.
 To help develop children’s fluency in mathematics, I
am going to ask them to learn Key Instant Recall Facts
each half term. I would hope that the children
practise their KIRFs at least 3 times a week.
Knowing numbers bonds to 10 ,20
and 100
 0 + 10 = 10
 1 + 9 = 10
 2 + 8 = 10
 3 + 7 = 10
 4 + 6 = 10
 5 + 5 = 10
 6 + 4 = 10
 7 + 3 = 10
 8 + 2 = 10
 9 + 1 = 10
 10 + 0 = 10
 0 + 20 = 20
 0 + 100 = 100
 1 + 19 = 20
 10 + 90 = 100
 2 + 18 = 20
 20 + 80 = 100
 3 + 17 = 20
 30 + 70 = 10
 4 + 16 = 20
 40 + 60 = 10
 5 + 15 = 20
 50 + 50 = 10
 6 + 14 = 20
 60 + 40 = 10
 7 + 13 = 20
 70 + 30 = 10
 8 + 12 = 20
 80 + 20 = 10
 9 + 11 = 20
 90 + 10 = 10
 20 + 0 = 20
 100 + 0 = 100
Knowing the multiplication and division
facts for the 2 times tables
2x1=2
2x2=4
2x3=6
2x4=8
 2 x 5 = 10
 2 x 6 = 12
 2 x 7 = 14
 2 x 8 = 16
 2 x 9 = 18
 2 x 10 = 20
2÷2=1
4÷2=2
6÷2=3
8÷2=4
 10 ÷ 2 = 5
 12 ÷ 2 = 6
 14÷ 2 = 7
 16÷ 2 = 8
 18÷ 2 = 9
 20÷ 2 = 10
I know doubles and halves
of numbers to 20
1+1=2
2+2=4
3+3=6
4+4=8
5 + 5 = 10
6 + 6 = 12
7 + 7 = 14
8 + 8 = 16
9 + 9 = 18
10 + 10 = 20
½ +2=1
½+4=2
½+6=3
½+8=4
½ + 10 = 5
½ + 12 = 6
½ + 14 = 7
½ + 16 = 8
½ + 18 = 9
½ + 20 = 10
Knowing the multiplication and division
facts for the 10 times tables
 10 x 1 = 10
 10 x 2 = 20
 10 x 3 = 30
 10 x 4 = 40
 10 x 5 = 50
 10 x 6 = 60
 10 x 7 = 70
 10 x 8 = 80
 10 x 9 = 90
 10 x 10 = 100
 10 ÷ 10 = 1
 20 ÷ 10 = 2
 30 ÷ 10 = 3
 40 ÷ 10 = 4
 50 ÷ 10 = 5
 60 ÷ 10 = 6
 70 ÷ 10 = 7
 80 ÷ 10 = 8
 90 ÷ 10 = 9
 100 ÷ 10 = 10
Telling the time
Children need to be able to tell the time using a
clock with hands. This target can be broken down
into several steps:
 I can tell the time to the nearest hour
 I can tell the the time to the nearest half hour
 I can tell the time to the nearest quarter hour
 I can tell the time to the nearest five minutes
Knowing the multiplication and division
facts for the five times tables
 5 x 1 =5
 5 x 2 = 10
 5 x 3 = 15
 5 x 4 = 20
 5 x 5 = 25
 5 x 6 = 30
 5 x 7 = 35
 5 x 8 = 40
 5 x 9 = 45
 5 x 10 = 50
 5 ÷ 5 =1
 10 ÷ 5 = 2
 15 ÷ 5 = 3
 20 ÷ 5 = 4
 25 ÷ 5 = 5
 30 ÷ 5 = 6
 35 ÷ 5= 7
 40 ÷ 5 = 8
 45 ÷ 5 = 9
 50 ÷ 5 = 10
Top tips for KIRFs
 The secret to success is practising little and
often. Use time wisely. Can you practise these
KIRF’s while walking to school or during a car
journey. You don’t need to practise them all at
once: perhaps you could have a fact of the day.
 Use what you already know e.g. use knowledge of
numbers bonds to ten to help with number bonds
to 20
 Play games: www.conkersmaths.com
http://www.conkermaths.org/cmweb.nsf/products/
timestablesballoons.html
 Songs and chants- you can buy times tables cd’s or
find multiplication songs and chants online. If your
child creates their own song this can be more
memorable.
 Test the parent
 Apply these facts to real life situations e.g. how
many toes are their in your house 10 x ?=
 Time- talk about the time. Make sure you have an
analogue clock in your house and that your child
actually wears a watch. Ask your child the time
regularly. E.g. the cakes need to come out of the
oven at half past 4 etc
Operators
Addition- Yr 1
Number lines
1.
2.
First number shows where to start.
Second number shows how many jumps to do.
8 + 4 =
Empty number lines – Yr2
1. Draw the line.
2. Biggest number at the beginning.
3. Second number is the amount of jumps.
4. Fill in the numbers
5. Find the answer.
8 + 4 = 12
+1
+1
8
9
+1
10
+1
11
12
Chunking- Yr 2
1. Draw the line.
2. Biggest number at the beginning.
3. Partition the second number.
4. Add on the tens.
5. Add on the units.
5. Find the answer.
13 + 12 = 25
10
+ 10
13
2
+2
23
25
Column addition (not crossing
the tens)
45 + 33
TU
45
+ 33
78
Column addition ( crossing the tens)
49 + 33
TU
49
+33
8 2
1
Multiplication
 Times tables
 Practise, Practise, Practise!!
Try:
 Visual posters
 Songs and rhymes
 Speed Tests
Repeated Addition
6 x 2 = 12
+6
+6
0
6
24
Partitioning
 1. Partition the biggest number.
 2. Multiply both partitioned numbers by the
smaller number.
 3. Add the 2 numbers together.
14 x
10
4
10 x 2 = 20
4x2=
8
20 + 8 = 28
2 = 28
Subtraction –Yr 1
Number lines
1.
First number shows where to start.
2. Second number shows how many jumps to do.
Jumps underneath the line.
8 – 3 = 5
Empty number lines- Yr 2
1. Draw the line.
2. First number at the end.
3. Second number is the amount of jumps.
4. Fill in the numbers
5. Find the answer.
12 – 4 = 8
8
9
-1
10
-1
11
-1
-1
12
Column subtraction (not
crossing the tens)
85 – 33= 52
TU
85
-33
52
Column subtraction (crossing the
tens)
43 - 29
TU
3
4 13
29
14
Division
Eggs in baskets
1. Draw 3 baskets (the second number
shows how many baskets to draw.
2. Share the first number into the
baskets.
3. Count all baskets to ensure you have
divided accurately.
12 ÷ 3 = 4
4
4
4
Division- numberline-Yr 2
1. Draw the line.
2. First number at the end.
3. Keep subtracting the second number until you reach
zero
4. Count the jumps
5. Find the answer.
12 ÷ 3 =
-3
0
-3
3
-3
-3
6
9
12
Finally...
•Practise is the key to retaining these
methods.
•Children should also practise these in
real situations.
•Keep it short, snappy and fun!!
Thank you for coming!