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St Paul's C of E Primary School

Heathside Grove

LEARNING to make a difference

13th January

Starter:

 

Can you remember your bonds to 20 and 100? Remember to use your bonds to 10 to help.

Write them out on your squared paper.

E.g. 20 + 0 = 20

       19 + 1 = 20

       18 + 2 = 20

       17 + 3 = 20

Carry on the pattern and do the same with your bonds to 100.

100 + 0 = 100

90 + 10 = 100

 

 

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

 

Today we are going to look at adding 2-digit numbers. Remember a 2-digit number has tens and ones. For example 52 and 31 are 2-digit numbers.

 

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

 

We are going to look at 32 + 14 =

 

The first method we will use is a number line.

Draw a line in your book and start with the largest number. In this case it is 32.

We are adding 14, which has 1 ten and 4 ones.

 

Do 1 jump of 10 which will add to 42 then 4 jumps for the ones.

E.g.

 

 

 

32 + 14 = 46

 

 

Have a go at these and remember to add the tens first and then the ones.

 

24 + 14 =             41 + 16 =           15 + 13 =           64 + 12 =

 

17 + 11 =                24 + 15           32 + 16 =         27 + 12 =

 

 

If you found these ok have a go at these:

 

21 + 21 =       34 + 21 =      45 + 22     34 + 24 =

 

Here is an example, you need to jump 2 tens for these.

 

 

 

 

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