Lesson 1

WALT subtract with dienes.

use 100 square to count back in 1s first then 10s

How would you solve this?

28 - 12 = ___

give chn time to solve before reminding them how to solve with dienes

What about this one?

33 - 16 = ___

give chn time to solve before reminding them how to solve with dienes - need to exchange

Solve these

26 - 5 = 37 - 15 = 66 - 28 =

independently

Challenge

50 - 10 - 17 =

How would you solve this?

26 - ___ = 15

chn should be able to rearrange number sentence and then solve using dienes

Let's do this one together

36 - ___ = 16

Try this one on your own

28 - ___ = 14

___ - 12 = 36Challenge

Now solve these on your own

27 - ___ = 20 43 - ___ = 13

34 - ___ = 28 36 - ___ = 15

___ - 15 = 15

Challenge

___ - ___ = 10

Add the correct sign < > =

28 - 15 34 - 16<Complete the number sentence

25 - 12 28 - __

<

28 - 8 - 10 = ___

Rachel says:

is the same as doing

28 - 18 = ___

Prove it.

Lesson 2

WALT use column subtraction with dienes.

We're going to use column subtraction to solve these now

28 - 13 = ___T O

T O

Let's do this one together

36 - 15 = ___

T O

T O

chn can draw dienes 

Try this one on your own

19 - 12 = ___

T O

T O

Now try this one on your own

43 - 20 = ___

T O

T O

Solve these on your own

29 - 5 = ___

37 - 15 = ___

29 - 23 = ___

Try this one

The pencil is 25cm long.

After sharpening it, it is now 11cm shorter.

How long is the pencil now?

problem solving

Try this one

Kelly has this much money.

She spends 25p.

How much money does Kelly have left?

Challenge: What coins might she have?

problem solving

What have I done wrong?

T O

56 - 23 = 79

reasoning problem

Lesson 3

WALT use column subtraction using dienes

26 - 7 = ___

How would you solve this?

draw dienes - exchange a ten for ten ones

T O

24 - 18 = ___

Let's try this one together

T O

draw dienes - exchange a ten for ten ones

33 - 27 = ___

Try this one on your own

T O

draw dienes - exchange a ten for ten ones

Solve these using dienes and column subtraction

chn write column subtraction and solve using dienes drawings

2 58-

341 7-

452 5-

402 8-

Write your own number sentence using these numbers and solve using column subtraction.

54 2618 27

37 19

Try this one

Jug A is holding some water.

Jug B is holding 15ml less. How much water is in Jug B?

Write the number sentence, solve it and then draw the correct amount of water.

Jug A

Jug B

problem solving

Lesson 4

WALT use column subtraction

When we write column subtraction, it is written like this:

25 - 15 = 2 5 1 5 -

Remember - we can use anywhere else to draw pictures if we need to!

T O

model without dienes

Try this one on your own

3 4 2 6 -

34 - 26 =

Write these calculations as column subtraction

3 3 - 1 2 =

2 9 - 6 =

Now try this one on your own

4 1 1 8 -

41 - 18 =

may need to do a few more as practise before starting in books

Write these calculations in your book as column subtraction and then solve them.

2 9 - 2 4 =

4 4 - 9 =

3 3 - 1 5 =

Find the even numbers, write a subtraction number sentence and solve using column subtraction

21 1916

2837

25 41

40228

Find the odd numbers, write a subtraction number sentence and solve using column subtraction

Always, sometimes, never true?

Even ­ Even = Even

Prove it.

reasoning problem at end of lesson

Lesson 5

WALT use column subtraction

Write these calculations as column subtraction and solve them

2 6 - 2 2 =

4 7 - 2 9 =

15p 12p 56p 60p 45p 21p

I have

I buy one banana.

How much change will I get?

15p 12p 56p 60p 45p 21p

I have

I buy one pear.

How much change will I get?

15p 12p 56p 60p 45p 21p

I have

I buy a watermelon.

How much change will I get?

15p 12p 56p 60p 45p 21p

I have

I buy two apples.

How much change will I get?

a. Harry has 75p. He buys a banana. How much change will he get?

c. Sarah buys two packets of strawberries. She pays with a £1 coin. How much change will she get?

d. Adam buys a banana and an apple. He gives the shopkeeper 50p. How much change will he get?

ChallengeKevin had 50p. He has already spent 20p in a different shop. Can he buy an apple? How do you know?

15p 12p 56p 60p 45p 21p

b. Lucy has three 10p coins. She buys a pear. How much change will she get?

Always, sometimes, never true?

Odd ­ Odd = OddProve it.

reasoning problem