Parents Numeracy Workshop

1
Parents Numeracy Workshop

• Session 2
• Strategies for
• Addition Subtraction

2
What can a numerate child do?

• By the age of 11 they should
  
• have a sense of the size of number and
  where it fits into the number system
• know by heart addition and subtraction
  facts to 20, multiplication and division
  facts to 10x10, doubles and halves,
  complements to 100, multiply and divide by
  10 and 100
• use what they know to figure out
  answers mentally

3
What can a numerate child do? (cont.)

• calculate accurately and efficiently, both
  mentally and on paper, using a range
  of strategies
• recognise when it is appropriate to use a
  calculator- and when it is not- and be
  able to use one effectively
• explain their methods and reasoning
  using correct mathematical terms
• judge whether their answers are
  reasonable and have strategies for checking
  them where necessary

4
The aim

• The aim is for children to do mathematics in
  their heads, and if the numbers are too
  large, to use pencil and paper to avoid
  losing track. To do this children need to
  learn quick and efficient methods,
  including appropriate written methods.

5
Learning written methods is not the ultimate aim.

• Mathematics is foremost an activity of the
  mind, and written calculations are an aid
  to that mental activity.
• The Numeracy Strategy aims to develop
  childrens mental strategies and then
  written methods that derive from and
  support mental methods.

6
We want children to ask themselves
Can I do this in my head? Can I do this in my
head using drawings or jottings? Do I need to use
an expanded/compact written method? Do I need a
calculator?
7
How do you add and subtract?
61 45 7800 5600 5735 3657 5735 3990 83
68 5002 4996 538 - 295 267 267 2.5
2.7 5.1 - 2.78
8
Mistakes children make
1
16 - 9
9
.and more
643 274 8117

• 803
• 526
• 187

10
Addition

• 76 47

11
Addition
358 473
11
120
700
831
12
Subtraction
Imran has 43 conkers he gives 24 away to his
friends. How many does he have left? 43 24

19 conkers
13
Subtraction
Sam has saved 93p, Amy has 55p. How much more
money does Sam have than Amy? 93 55
38p more
14
Subtraction
8.23 4.55 3.68
0.23
3
0.45
8.23
8.00
4.55
5.00
15
Subtraction
A sports stadium holds 9010 spectators. 5643
people attend a football match. How many empty
seats are there?
57
300
3010
5643
5700
9010
6000
3367 empty seats