Lesson 1 WALT subtract with dienes. use 100 square to count back - - PowerPoint PPT Presentation

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Lesson 1 WALT subtract with dienes. use 100 square to count back - - PowerPoint PPT Presentation

Mar 08, 2023 101 likes •564 views

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

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SLIDE 1

Lesson 1 WALT subtract with dienes.

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SLIDE 2

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

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SLIDE 3

How would you solve this?

28 - 12 = ___

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

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SLIDE 4

What about this one?

33 - 16 = ___

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

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SLIDE 5

Solve these

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

independently

Challenge

50 - 10 - 17 =

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SLIDE 6

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

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SLIDE 7

Try this one on your own

28 - ___ = 14 ___ - 12 = 36

Challenge

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Now solve these on your own

27 - ___ = 20 43 - ___ = 13 34 - ___ = 28 36 - ___ = 15 ___ - 15 = 15

Challenge

___ - ___ = 10

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SLIDE 9

Add the correct sign < > =

28 - 15 34 - 16

<

Complete the number sentence

25 - 12 28 - __

<

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SLIDE 10

28 - 8 - 10 = ___

Rachel says: is the same as doing

28 - 18 = ___

Prove it.

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SLIDE 11

Lesson 2 WALT use column subtraction with dienes.

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SLIDE 12

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

28 - 13 = ___

T O

T O

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SLIDE 13

Let's do this one together

36 - 15 = ___

T O

T O

chn can draw dienes

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SLIDE 14

Try this one on your own

19 - 12 = ___

T O

T O

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SLIDE 15

Now try this one on your own

43 - 20 = ___

T O

T O

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SLIDE 16

Solve these on your own

29 - 5 = ___ 37 - 15 = ___ 29 - 23 = ___

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SLIDE 17

Try this one

The pencil is 25cm long. After sharpening it, it is now 11cm shorter. How long is the pencil now?

problem solving

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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

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What have I done wrong? T O

56 - 23 = 79

reasoning problem

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Lesson 3 WALT use column subtraction using dienes

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SLIDE 21

26 - 7 = ___

How would you solve this?

draw dienes - exchange a ten for ten ones

T O

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SLIDE 22

24 - 18 = ___

Let's try this one together

T O

draw dienes - exchange a ten for ten ones

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SLIDE 23

33 - 27 = ___

Try this one on your own

T O

draw dienes - exchange a ten for ten ones

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SLIDE 24

Solve these using dienes and column subtraction

chn write column subtraction and solve using dienes drawings

2 5 8

  • 34

1 7

  • 45

2 5

  • 40

2 8

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SLIDE 25

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

54 26 18 27 37 19

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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

  • f water.

Jug A Jug B

problem solving

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SLIDE 27

Lesson 4 WALT use column subtraction

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SLIDE 28

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

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SLIDE 29

Try this one on your own

3 4

2 6

  • 34 - 26 =
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Write these calculations as column subtraction

3 3 - 1 2 = 2 9 - 6 =

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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

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

2 9 - 2 4 = 4 4 - 9 = 3 3 - 1 5 =

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

21 19 16 28 37

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SLIDE 34

25 41 40 22 8

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

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Always, sometimes, never true?

Even ­ Even = Even

Prove it.

reasoning problem at end of lesson

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Lesson 5 WALT use column subtraction

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Write these calculations as column subtraction and solve them

2 6 - 2 2 = 4 7 - 2 9 =

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SLIDE 38

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

I have I buy one banana. How much change will I get?

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SLIDE 39

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

I have I buy one pear. How much change will I get?

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SLIDE 40

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

I have I buy a watermelon. How much change will I get?

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SLIDE 41

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

I have I buy two apples. How much change will I get?

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  • 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? Challenge Kevin 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?

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SLIDE 43

Always, sometimes, never true?

Odd ­ Odd = Odd

Prove it.

reasoning problem

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