Homerswood Homerswood Primary SchoolPrimary School

Year 1 to 4 Year 1 to 4 Maths Parent WorkshopMaths Parent Workshop

Thursday 6Thursday 6thth March 2014 March 2014

AimsAims

To explain how we teach your child to To explain how we teach your child to add and subtract.add and subtract.

To give you some ideas of how you can To give you some ideas of how you can help and support your child at home.help and support your child at home.

Addition VocabularyAddition Vocabulary

together together more thanmore than plus plus addadd total total andand sumsum

AdditionAddition

Adding practicallyAdding practically

3 + 2 =5

AdditionAddition6 + 4 = 106 + 4 = 10

Encourage children to Encourage children to put put the biggest number in the biggest number in their their head and count head and count on.on.

6

AdditionAddition Use of number line to count onUse of number line to count on

6 + 5 =6 + 5 =

6 11

7 8 9 10

6

541 2 3

Place ValuePlace ValueTens and UnitsTens and Units

Recognizing the value of each digit Recognizing the value of each digit in 2 or more digit numbers.in 2 or more digit numbers.

PartitioningPartitioning

This is a ten stick. It is made up of 10 units, or ones, stuck together.

This is a unit. It is one square on its own.

What number is this?What number is this?

We have made 13.

1 ten 3 units

What number is this?What number is this?

We have made 40

4 tens 0 units

Addition using place value on a Addition using place value on a number squarenumber square

35+ 26 = ?

Find 35 on the number square.

Partition 26 = 2 tens + 6

Move down –

45

55

Add 6 more.

Addition by partitioningAddition by partitioning

45 + 34 = 7945 + 34 = 79

4545 + 30 + 4 (Partition the smallest number into 10s + 30 + 4 (Partition the smallest number into 10s and 1s)and 1s)

45 + 4 = 49 (Add the units onto the number)45 + 4 = 49 (Add the units onto the number)

49 + 30 = 7949 + 30 = 79 (Add the tens onto get the final (Add the tens onto get the final answer)answer)

Using an empty number line

So we start at the biggest number…47

So….

25 + 47 =72

47

67 68 69

+20

+1

70 71

+1

72

+1

+1

+1

47 + 25 =

Have a go togetherHave a go together

85 + 44 =85 + 44 =(40 + 4)(40 + 4)

12985

34

44 54 57

+10 +10+3

So what is 34 57

10 + 10 + 3 = 23

So…..

+ 34 = 5723

+ 34 = 57

Number bonds to 10/20/100Number bonds to 10/20/100

10 + 0 = 1010 + 0 = 10 2 + 8 = 102 + 8 = 10

9 + 1 = 109 + 1 = 10 1 + 9 = 101 + 9 = 10

8 + 2 = 108 + 2 = 10 0 + 10 = 100 + 10 = 10

7 + 3 = 107 + 3 = 10

6 + 4 = 106 + 4 = 10

5 + 5 = 105 + 5 = 10

4 + 6 = 104 + 6 = 10

3 + 7 = 10 3 + 7 = 10

Addition using tens and unitsAddition using tens and units

It is vital that children understand It is vital that children understand the value of each digit for column the value of each digit for column addition. addition.

Partitioning

Level 3:Level 3:Partitioned vertical method: Partitioned vertical method:

20 + 320 + 330 + 230 + 250 + 5 = 5550 + 5 = 55

Level 4:Level 4:Standard vertical method: Standard vertical method:

6 2 5 with carrying6 2 5 with carrying+ 3 8+ 3 8 6 6 36 6 3 1 1

Subtraction VocabularySubtraction Vocabulary

difference betweendifference between subtract subtract fewer fewer minus minus take fromtake from less thanless than take awaytake away

4 – 2 =4 – 2 =

1 2 3 4

Taking away practicallyTaking away practically

SubtractionSubtraction

30 – 5 =

25

Use of a 100 square to take awayUse of a 100 square to take away

43-20 = 23

10 – 5 =

5

Use of a number lineUse of a number line

43 – 27 = 43 – 27 =

27

37

+10+3 +3

40 43

10 + 3 + 3 = 16

16

Subtraction using a blank number Subtraction using a blank number line (counting on)line (counting on)

54 – 32 = 54 – 32 =

32

52

+20+1 +1

53 54

20 + 1 + 1 = 22

22

Have a go togetherHave a go together

Subtraction using a blank number Subtraction using a blank number line line

Counting BackCounting Back

67 – 23 = 4467 – 23 = 44

Partition first, then count back.Partition first, then count back.

67

44

47

- 20

- 3

Column Subtraction

1 5 6 8 3 -

3

1

7

How you can support your childHow you can support your child

Look for and talk about numbers in the Look for and talk about numbers in the environmentenvironment

Play gamesPlay games ShoppingShopping Counting on/backCounting on/back Number bondsNumber bonds Doubles/HalvesDoubles/Halves Time tablesTime tables Division factsDivision facts

WebsitesWebsiteshttp://www.mathletics.co.uk

http://nrich.maths.org/public/

http://www.bbc.co.uk/schools/ks2bitesize/maths/number.shtml

http://www.teachingtime.co.uk/

http://teachingtables.co.uk

http://www.bbc.co.uk/schools/laac/menu.shtml

http://www.woodlands-junior.kent.sch.uk/interactive/literacy/index.htm

http://www.coxhoe.durham.sch.uk/

Thank you for comingThank you for coming& &

any questions?any questions?