1. Chatelherault Primary School
Numeracy
Across the Curriculum
Chatelherault Primary School

2. Numeracy Working Party
Chatelherault Primary

3. Numeracy Working Party
Chatelherault Primary
When adding/subtracting decimals, each decimal number should have the same amount of digits. This means filling in the blanks with zero’s.

4. Numeracy Working Party
Decimal Multiplication
STEP1: x by 10,100,1000
STEP2: x by 2,3,4,5 etc
Examples: x x 600
STEP 1: x 10 = x 100 = 6730
STEP 2: x 3 = x 6 = 6730
x x
Chatelherault Primary
Decimal Numbers
Pupils are generally taught to move the decimal point to the right by 1,2 or 3 positions (x10, 100 or 1000). Note how a zero was added in Example 2 when multiplying by 100. 2 4 1

5. Numeracy Working Party
Decimal Division (multiples of 10, 100, 1000).
STEP1: ÷ by 10,100,1000
STEP2: ÷ by 2,3,4,5 etc
Examples: ÷ ÷ 500
STEP 1: ÷ 10 = ÷ 100 = 4.215
STEP 2: ÷ 3 = ÷ 5 = 0.843
The answers to STEP 2 were calculated using the technique illustrated in the previous slide.
Chatelherault Primary
Decimal Numbers
Pupils are generally taught to move the decimal point to the left by 1,2 or 3 positions (÷10, 100 or 1000). A very common mistake is to divide by 10, 100, 1000 the multiply by 2, 3, 4 etc.

6. Numeracy Working Party
Chatelherault Primary
Percentages and their equivalent fractions must be memorised.

7. Numeracy Working Party
Harder Percentages
Calculator Method
Non -
e.g. 17.5% of 300
10% 300 ÷ 10 = £30
5% 30 ÷ 2 = £15
2.5% ÷ 2 = £ 7.50
£52.50
17.5 %
e.g. 19% of £60
19 ÷ 100x 60 =
£11.40
Chatelherault Primary
Alternative method for using a calculator would be 0.19 x 60 = £11.40

8. Numeracy Working Party
Chatelherault Primary
With decimal quantities the decimal point moves left or right respectively when ÷/× by 10, 100, 1000.

9. Numeracy Working Party
Solving Equations
Examples:
3x + 4 = x – 3 = 3x + 7
3x = 13 – x – 3x = 7 + 3
3x = x = 10
x = x = 5
Rule: Change side Change sign
Chatelherault Primary
There are other methods used to solve equations but this method is predominately used in the Maths Department.

10. Numeracy Working Party
When working out time difference we will use the
Counting
On Method
. This method will always work.
Example :
Find the time difference between
08 40 hrs and hrs
08 40
11 00
11 10
Hrs
Mins 20 2 10 30
nearest
hour
what’s
left +
09 00
hours
20 mins
2 hrs
10 mins O
riginal
time
Time Intervals
Chatelherault Primary
Another method would involve adding on whole hours i.e to 1040 = 2 hours then 1040 to 1100 = 20 mins then 1100 to 1110 = 10 mins.

11. Numeracy Working Party
Chatelherault Primary
Alternative method for perimeter could be (2 x 6) + (2 x 3) = 18cm

12. Numeracy Working Party
Chatelherault Primary

13. Numeracy Working Party
Heilander’s
Porridge Oats
Volume = l x b x h
27cm
Volume = 18 x 5 x 27
Volume = 2430 cm3
Chatelherault Primary
Generally, we show three lines of working. Formula, working, answer with units.
5 cm
18 cm
1 Litre = 1000ml
1ml = 1cm3

14. Numeracy Working Party
Chatelherault Primary

15. Numeracy Working Party
Naming Angles
Chatelherault Primary
DÊF is an alternative notation for angle DEF.

16. Numeracy Working Party
Horizontal
Acute
less than 90 o
Obtuse
Between 90 –
180
Right
Angle
exactly 90
reflex
over 180
less than 360
Straight Line Angle
Type of Angles
Chatelherault Primary

17. Numeracy Working Party
Finding Missing Angles
120 o 95
Angles round a point
always add up to 360 65
Two angles making a
straight line add
up to
180
(Supplementary angles)
Angles
opposite each other
at a cross are equal. 34
115
146
145 35
right angle add 90
(Complementary angles) 55
Chatelherault Primary

18. Numeracy Working Party
Chatelherault Primary

19. Numeracy Working Party
Bar Graph
Favourite Pets
Cat
Dog
Rabbit
Hamster
Snake 2 4 6 8 10 12
Number of Pupils
Pets
What labels should we
use for the Bar Chart
Title, Scale, Labels and
Units where appropriate
Chatelherault Primary

20. Numeracy Working Party
Constructing a Line Graph
A hospital nurse recorded a patient’s temperature every hour
Temperature versus Time 97 98 99
100
101
102
103
Temp C
100.5
6:00 am
8:00 am
9:00 am
10:00 am
11:00 am
7:00 am
Chatelherault Primary
Line graphs are most often used to show trends over time.
Temperature C
Time Hours

21. Numeracy Working Party
Revision is active
NOT passive
Success is
99% perspiration
1% inspiration
Expect to get out
what you put in .
Study Skills For Success
Practice makes
perfect !
Practise the things
you find difficult !
Chatelherault Primary