Reevy Hill Primary School

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Maths

Subtraction continued...

 

Task 1

Have a look at the example below

Remember you start off by circling number 12 on the number line, then you need to subtract (take away) 5. So you need to jump back 5 jumps from 12 (the number should get smaller). The number that you end up on is your answer (7). This needs to be written after the = (equals) sign because 12-5=7.

 

Now have a go at the questions below. 

Task 2

Have a look at the missing number problems. See if you can solve them, using the example below.

We start the same way we have done before, by circling the first number in the equation (in this case 10).

This time we circle the number after the = sign (in this case 5) because that is the number we need to get to (the total).

Then we jump from number 10 to number 5 and count the jumps as we do this (5). 5 is our missing number because 10-5=5 

Have a go at the other example. Remember start at 10, circle it and then circle the the number you were left with (8). Count the jumps you make from 10 to 8 and this will give you the missing number.

 

Now have a go at these ones

Task 3

Now we are going to move onto solving missing numbers within 20.

 

Look at the example below.

It is the same method as before just with bigger numbers.

 

Have a go at the ones below

Task 4

Have a look at the example of the worded number problems.

 

Mum has 11 chairs so we start off by circling 11 on the number line and writing 11 in the first part of our number problem.

 

Then we read on and see that 2 of the chairs have broken. So we need to take away 2 chairs- so you need to make 2 jumps backwards on the number line and also write 2 after the -(subtract) sign in our problem.

 

Finally we circle the number we got to when we made 2 jumps backwards- which was 9, so we write 9 after the = (equals) sign in our problem because that is the answer/total.

 

It looks like this 11-9=2

Now try doing the ones below, using the same method.

Task 5

Is this right?

Put a tick if they are correct.

Put a x if they are wrong and then correct it.

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