Maths task · 2020. 11. 16. · Maths task LO: To understand how to add using the column method. What we have learnt so far! ... Finally, I know that 9 + 1 = 10 but what do I do now?

Maths taskLO: To understand how to add

using the column method.

What we have learnt so far!

• How the column method is structured on a page

• How to arrange numbers using our knowledge of place value

• To use our knowledge of commutative law to recognise what numbers we can subtract to get a whole number.

• How to exchange numbers when our minuend digit is smaller than our subtrahend digit.

Addition using the column method is very similar

• We still arrange our numbers in the same way (largest on top and smaller on bottom) as this makes the question easier to solve.

• We still work from right to left!

• We use our knowledge of place value to place our numbers in the correct place

Let’s try one together

Working from right to left, I know that we can solve 2 + 1

which is 3!

Let’s try one together

Working from right to left, I know that we can

solve 50 + 40 which is 90.

So we need to put 9 underneath our tens

column.

Our answer is 93

Easy right? Do we ever need to exchange in addition?

Take a look at the question on the left.

When we add 8 + 5 we get an answer that is larger than 10!

There is only room for 1 digit to go in that place.

What do we do? We need to carry


I know that 8 + 5 = 13

Firstly, I am going to place my ‘3’ underneath the units

I still have ten left over

3


I know that 8 + 5 = 13

Secondly, I am going to place my ten by carrying it over to my tens column and I will place it underneath my

difference bar.

3

1


Finally, I know that 30 + 40 = 70.

But, I still have my ten underneath which I am going to add to this to 70 which makes 80!

So I put 8 in my tens column.

My answer is 833

1

8


To have a better understanding of carrying numbers, watch the video below which can be found on the 5MR

NOV 2020 playlist. Here is the link -https://youtu.be/tJxPFGMFCyQ

https://youtu.be/tJxPFGMFCyQ

What about larger numbers?

What about larger numbers?REMEMBER – We work from right to left

Firstly, I know that 7 + 5 is going to give me an answer greater than 10.

7 + 5 = 12

So, I need to place my 2 units underneath the units column.

Then, I place my 10 underneath the difference bar in the tens column 2

1


Next, I know that 1 + 3 gives an answer lower than 10!

1 + 3 = 4

The same as 10 + 30 = 40

I need to remember the 10 that I can carried across and add this to my answer.

40 + 10 =50

So I place 5 underneath my tens column

21

5


Finally, I know that 4 + 2 gives me an answer below 10

4 + 2 = 6

The same as 400 + 200 = 600

So I need to place 6 underneath my hundreds column

My answer is 65221

56

What happens when my last

digits that I am adding are more

than 10?

Firstly, I know that 5 + 6 has an answer more than 10 so we need to carry

5 + 6 = 11

So, I need to place my 1 unit underneath the units column

My remaining 10 goes underneath the difference bar of the ten columns

1

1

Secondly, I know that 3 + 4 is less than 10 so I do not need to carry this time.

3 + 4 = 7The same as 30 + 40 =70

However, I need to add my ten to my answer making it 8!

So I place 8 underneath the tens column

1

1

8

Finally, I know that 9 + 1 = 10 but what do I do now?

Well, if you get this in your final addition stage then you need to put both digits!

Looking at the two numbers you can see that my answer will go into the thousands.

So, I simply place my 0 underneath the hundreds column and place my 1 in my new thousands space.

My answer is 1,081

1

1

81 0

If you still need help with your understanding

Do not be afraid to re-watch the video on the part that you are stuck on ☺



Your turn! Remember to use the column method to show your understanding

1 star 2 star 3 star

1. 73 + 25

2. 67 + 21

3. 44 + 35

4. 34 + 26

5. 57 + 38

1. 329 +130

2. 564 + 339

3. 632 + 456

4. 1349 + 261

5. 2345 + 1476

1. 2345 + 1476

2. 5781 + 2192

3. 11,345 + 8493

4. 15,865 + 10,162

5. 78, 876 + 22, 114

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Maths task · 2020. 11. 16. · Maths task LO: To understand how to add using the column method. What we have learnt so far! ... Finally, I know that 9 + 1 = 10 but what do I do now?