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

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 independently 26 - 5 = 37 - 15 = 66 - 28 = Challenge 50 - 10 - 17 =

How would you solve this? chn should be able to rearrange number sentence and then solve using dienes 26 - ___ = 15 Let's do this one together 36 - ___ = 16

Try this one on your own 28 - ___ = 14 Challenge ___ - 12 = 36

Now solve these on your own 27 - ___ = 20 43 - ___ = 13 34 - ___ = 28 36 - ___ = 15 Challenge ___ - 15 = 15 ___ - ___ = 10

Add the correct sign < > = < 28 - 15 34 - 16 Complete the number sentence < 25 - 12 28 - __

Rachel says: 28 - 8 - 10 = ___ 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 O T 28 - 13 = ___ O T

Let's do this one together O 36 - 15 = ___ T O T chn can draw dienes

Try this one on your own O 19 - 12 = ___ T O T

Now try this one on your own O 43 - 20 = ___ T O T

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

How would you solve this? O T 26 - 7 = ___ draw dienes - exchange a ten for ten ones

Let's try this one together O T 24 - 18 = ___ draw dienes - exchange a ten for ten ones

Try this one on your own O T 33 - 27 = ___ draw dienes - exchange a ten for ten ones

Solve these using dienes and chn write column subtraction and solve using dienes drawings column subtraction 3 4 2 5 - - 8 1 7 4 0 4 5 - - 2 8 2 5

Write your own number sentence using these numbers and solve using column subtraction. 18 27 26 54 19 37

Try this one Jug A Jug A is holding some water. Jug B is holding 15ml less. How much water is in Jug B? Jug B Write the number sentence, solve it and then draw the correct amount of water. problem solving

Lesson 4 WALT use column subtraction

When we write column subtraction, it is written like this: T O 2 5 - 1 5 25 - 15 = model without dienes Remember - we can use anywhere else to draw pictures if we need to!

Try this one on your own 34 - 26 = 3 4 - 2 6

Write these calculations as column subtraction 3 3 - 1 2 = 2 9 - 6 =

Now try this one on your own 41 - 18 = 4 1 - 1 8 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 19 21 16 28 37

Find the odd numbers, write a subtraction number sentence and solve using column subtraction 41 25 40 22 8

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 =

12p 21p 60p 15p 45p 56p I have I buy one banana. How much change will I get?

12p 21p 60p 15p 45p 56p I have I buy one pear. How much change will I get?

12p 21p 60p 15p 56p 45p I have I buy a watermelon. How much change will I get?

12p 21p 60p 15p 45p 56p I have I buy two apples. How much change will I get?

12p 21p 60p 15p 45p 56p a. Harry has 75p. He buys a banana. How much change will he get? b. Lucy has three 10p coins. She buys a pear. How much change will she 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?

Always, sometimes, never true? Odd ­ Odd = Odd Prove it. reasoning problem