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St Paul's C of E Primary School

Heathside Grove

LEARNING to make a difference

15th January

Starter:

 

Complete the number sequences:

 

2, 4, --, 6, 8, --

32, 31, --, 29, --, 27, 26, --, --

35, 45, --, 65, --, --, 95

5, 10, --, 20, --, --, 35, --

 

 

 

LO: To know how to add 2-digit numbers.

 

Today we are going to continue adding 2-digit numbers. However, this time we will look at exchanging 10 ones for a ten.

 

You will need a pencil and square paper, your number square will also be helpful if needed (to help counting in tens).

 

 

We are going to look at 26 + 16

We are going to use ‘chips and peas’

Remember chips represent tens and peas represent ones.

 

First draw chips and peas to represent the numbers.

 

 

 

 

Then if there are more than 10 ones altogether, we need to exchange 10 ones for 1 ten.

We know that we can add 4 to 6 to make 10, so cross out 4 ones and add to 26. We have made another 10 so exchange the ones for a ten like this:

 

 


Then count how many tens – 4 tens

Then count the ones – 2 ones

The answer is 42

 

 

Have a go at these using chips and peas to work them out.

Remember if you have more than 10 ones you can exchange for a ten.

Good luck!

 

34 + 27 =             64 + 17 =           27 + 19 =           27 + 15 =

 

49 + 14 =                64 + 28          42 + 29 =         38 + 27 =

 

If you found these ok have a go at these:

 

37 + 28 =       45 + 38 =      29 + 22     66 + 37 =

 

 

 

Challenge:

Bertie has 26 treats and Beth gives him another 15.

How many does he now have?

Remember to show your working out.

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