1. Hadleigh Infant and Nursery School
Maths: Addition and Subtraction
Information Session
21st November 2017

2. Year 1 and 2 Learning Expectations

3.
Objects
Pictures

4.
Numicon

5.
Number line
Addition is commutative (it can be done in any order)
Subtraction is not commutative.
e.g 

6. 45 + 24 45 - 24 Hundred square 45 + 24 Find 45 Jump down to add
Hundred square
Find 45
Jump down to add
your tens.
Move forwards to add
your ones
24 has 2 ten and 4 ones

7. 45 + 24 45 - 24 Hundred Square 45 – 24 Find 45 Jump up to subtract
Hundred Square
45 – 24
Find 45
Jump up to subtract
your tens
Move backwards to
subtract your ones

8. 45 + 24 45 + 24 Partitioning 40 and 5 20 and 4
Add the tens = 60
Add the ones = 9
Add your answers = 69

9.
Blank number line 21
1. Place the largest number at the beginning of your number line.
2. Add your tens-14  1 ten
3. Add your ones – 14  4 ones
+10 +1 +1 +1 +1 31 32 33 34 35

10.
Blank number line 38
Place your first number at the end of your number line.
Take away the tens 23  2 tens
Take away the ones 23  3 ones
- 10
- 10
- 1
- 1
- 1 15 16 17 18 28

11. 21 + 15 Column Addition Carrying the tens 35 + 27 T O 1. Add the ones
Add the tens
3 6
Carrying the tens
T O = 12
ones and 1 ten
Save your extra ten
by placing it below. 1
Remember to add your extra ten!

12. Now it’s your turn 6 + 3 = 17 + 9 = 26 + 32 = 48 + 27 = 9 – 5 =
18 – 7 =
38 – 24 =
73 – 36 =

13. Number bonds and Number facts
1 + 9 = = = = 20
10 – 9 = – 1 = – 9 = – 11 = 9
= = – 90 = – 10 = 90 10 7 3

14. Inverse
The operation that reverses the effect of another operation.
= 87
87 – 31 = 56

15. Reasoning is now seen as the magic ingredient in maths teaching.
Being able to reason enables children to justify what they are doing, make predictions, generalise and explore - they will be able to make sense of mathematics.

16. Reasoning and problem solving
are key elements of the National Curriculum and this is reflected in recent KS1 SAT papers and the types of question asked..

17. Reasoning about addition
For example:
Knowing the sum of three odd numbers will always be odd.
= 18  ‘I know this is incorrect as the answer is even’ 

18. If children are going to be really successful in maths then they must be able to reason and know what to do to solve problems.

19. Here is part of a number square5 6 7 8 9 15 16 17 25
Add together the two numbers that
would be in the shaded squares.

20. 5 2 6 Here are some digit cards.
Meg and Sam each use two of the cards to make a number.
What is the difference between their two numbers? 2 5 6
I have made the largest number you can make.
I have made
the smallest
number you
can make

21. Razza and Gina have the same number of stickers.
1 2
 Razza gives 15 stickers away.
 Gina gives 32 stickers away.
How many more stickers than Gina does Razza have now?

22. Complete the number sentences.
= 10 = =
Explain your methods.

23. Complete the number sentences.=
37 = =
Explain your methods.

24. Remember to make maths fun!

25. Any questions?
Multiplication and Division Information Session on Tuesday 5th Decemeber