 3    # Y2 Maths: Column Method for Taking Away

Hello everybody!

Last week I asked you to do some addition using the column method. This week I want you to focus only on taking away.

Some of you may have done your MyMaths task already. If you didn’t score above 70%, remember you need to do it again if you want to win two merits. Watch my video and then try your MyMaths again, or try the activities below the video.

I recorded this video before my surgery.

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It’s very important you practise the column method for subtraction, as it takes some getting used to. Here are some more questions you can complete. Send your answers to westgreen.yellowclass@gmail.com to win another merit.

The first page does not include any regrouping, so I’m sure even my Maths Group can have a go at it without too much trouble! Just remember to use columns. Please go to Page 3 for the regrouping problems (on the sheet regrouping is called ‘exchanging’).

subtraction problems

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Look at my tower from the beginning of the video.

If the tower was 1 bottle high, there would be 1 bottle.

If the tower was 2 bottles high, there would be 3 bottles.

If the tower was 3 bottles high, there would be 6 bottles.

If the tower was 4 bottles high, there would be 10 bottles.

If the tower was 5 bottles high…

If the tower was 6 bottles high…

In the comments, keep going as far as you can go with this pattern. What pattern can you see? Explain it.

• Melina Ada says:

Hi Mr Morgan,
If the tower was 5 bottles high, it would be 15 bottles altogether.
If the tower was 6 bottles high, it would be 21 bottles altogether.
??

• saule says:

Hello Mr.Morgan

If the tower was 5 bottles high,there would be 15 bottles.

If the tower was 6 bottles high,there would be 21 bottles.

Thank you for interesting questions.

• Mr Morgan says:

Can either of you go any further?

What about 7 bottles high? Then 8 bottles high? You could keep adding and you could use the column method to add!

Super Question: How many rows of bottles could you make with 100 bottles?

• Safiyyah says:

If there was 7 bottles there would be 28 bottles.
If there was 8 bottles there would be 35 bottles.
If there was 9 bottles there would be 42 bottles.
If there was 10 bottles there would be 49 bottles.

• Mr Morgan says:

You are correct with 7 bottles.

However you are incorrect with 8 bottles. This is because you keep adding the number 7, and that is not the rule needed to work out 8 bottles.

Therefore 9 bottles and 10 bottles are incorrect as well. Great effort though!

• Aaron says:

Hi.
7 bottles high = 28 Then 8 bottles high is = 36.
14 bottles high = 105 bottles.
Thank you.

• Mr Morgan says:

Very good Aaron. However if I have 100 bottles, the answer to my super question must be 13 rows. As I wouldn’t be able to make all of my fourteenth row!

• Vihansa says:

Hi Mr Morgan,
If the tower is 5 bottles high there would be 15 bottles.
If the tower is 6 bottles high there would be 21 bottles.
If the tower is 7 bottles high there would be 28 bottles.
If the tower is 8 bottles high there would be 36 bottles.
If the tower is 9 bottles high there would be 45 bottles.
If the tower is 10 bottles high there would be 55 bottles..
If the tower is 11 bottles high there would be 66 bottles.
If the tower is 13 bottles high there would be 91 bottles.
If the tower is 14 bottles high there would be 105 bottles.
you can’t balance the tower with 100 bottles.

• Vihansa says:

When it comes to the 15th row, you have to add 15 to the total number of bottles in the 14th row so on…

• Mr Morgan says:

Well done for spotting the pattern! Very good.

• Aaron says:

Hi.
If the tower was 5 bottles high, it would be 15 bottles.
If the tower was 6 bottles high, it would be 21 bottles .
Thank you

• Mr Morgan says:

Go further like Safiyyah tried to do!

Look at my comment above and see if you can complete the super question.

• Melina Ada says:

Hi Mr Morgan,
If the tower was 7 bottles high, it would be 28 bottles.
If the tower was 8 bottles high, it would be 36 bottles.
Super Question: 13 rows makes 91 bottles.

• Mr Morgan says:

Absolutely perfect Melina. Fantastic maths work, well done.

• Safiyyah says:

If there was 5 bottles there would be 15 bottles because 10+5=15 or 5+5+5=15 bottles.
If there was 6 bottles there would be 21 bottles because 10+5+6=21.

• Mr Morgan says:

Very good explanations.

• kianosh says:

a]33-11=22
b]25-13=12
c]16-10=6
d]27-16=11
e]29-12=17
f]26-13=13
g]32-20=12
h]29-14=15
I]42-12=30
j]27-23=4
k]27-12=15
l]38-27=11
m]48-36=12
n]33-13=20
o]39-21=18
p]46-22=24
q]58-25=33
r]63-31=32
s]76-55=21
t]59-37=22
u]84-60=24
v]76-45=31
w]67-44=13
x]58-36=24
y]85-52=33

• Mr Morgan says:

Well done. These were easier because there was no regrouping, but it still takes great maths to get them all correct!

Click on the down arrow on the sheet and find page three. These questions need regrouping and are a little bit difficult. Maybe Daryosh will help you!

• Saule says:

Hello,
if the tower was 7 bottles high,it would be 28
if the tower was 8 bottles high, it would be 36
if the tower was 9 bottles high,it would be 45
if the tower was 10 bottles high,it would be 55

• Mr Morgan says:

Excellent answers, very well done. It’s an interesting pattern!

• Safiyyah says:

If the tower was 5 bottles high, there would be 15 bottles.
If the tower was 6 bottles high, there would be 21 bottles.
If the tower was 7 bottles high, there would be 28 bottles.
If the tower was 8 bottles high, there would be 36 bottles.
If the tower was 9 bottles high, there would be 45 bottles.
If the tower was 10 bottles high, there would be 55 bottles.
If the tower was 11 bottles high, there would be 66 bottles.
If the tower was 12 bottles high, there would be 78 bottles.
If the tower was 13 bottles high, there would be 91 bottles.
If the tower was 14 bottles high, there would be 105 bottles.
If the tower was 15 bottles high, there would be 120 bottles.
If the tower was 16 bottles high, there would be 136 bottles.

• Safiyyah says:

The total bottles keep going up by the number of bottles high. For example: The total for a 5 bottle tower is 15 bottles. This number keeps going up by the number of bottles added to the tower.

• Mr Morgan says:

Excellent explanation, very well done!

• Adem says:

Hello
– If the tower was 5 bottles hight, it would be 15 bottles.
-If the tower was 6 bottles high, it would be 21 bottles.
– If the tower was 7 bottles hight, it would be 28 bottles.

• Mr Morgan says:

Correct Adem, well done. I hope you understood the video.

• Yi Xuan Lin says:

If the tower was 5 bottles high, there would be 15 bottles.
If the tower was 6 bottles high, there would be 21 bottles.
If the tower was 7 bottles high, there would be 28 bottles.
If the tower was 8 bottles high, there would be 36 bottles.
If the tower was 9 bottles high, there would be 45 bottles.
If the tower was 10 bottles high, there would be 55 bottles.
If the tower was 11 bottles high, there would be 66 bottles
If the tower was 12 bottles high, there would be 78 bottles.
If the tower was 13 bottles high, there would be 91 bottles.
If the tower was 14 bottles high, there would be 105 bottles.
If the tower was 15 bottles high, there would be 120 bottles.
If the tower was 16 bottles high, there would be 136 bottles.
If the tower was 17 bottles high, there would be 153 bottles.
If the tower was 18 bottles high, there would be 171 bottles.
If the tower was 19 bottles high, there would be 190 bottles.
If the tower was 20 bottles high, there would be 210 bottles.
If the tower was 21 bottles high, there would be 231 bottles.
If the tower was 22 bottles high, there would be 253 bottles.
If the tower was 23 bottles high, there would be 276 bottles.
If the tower was 24 bottles high, there would be 300 bottles.
If the tower was 25 bottles high, there would be 325 bottles.
If the tower was 26 bottles high, there would be 351 bottles.
If the tower was 27 bottles high, there would be 378 bottles.
If the tower was 28 bottles high, there would be 406 bottles.
If the tower was 29 bottles high, there would be 435 bottles.
If the tower was 30 bottles high, there would be 465 bottles.

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