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Friday, 26 June 2020
Subtraction using the written method
WALT to work out very long problems using the written method. Today we had to work out problems using the written method, also known as column maths. It was easy as I have known this strategy since I was 5. This is how you do it. So you put the highest number at the top ( in this case 26 054) and the low number at the bottom (in this case 14578). Then you subtract. Now 4-8 isn't possible unless you wanted to go below 0. So you have to cross out the four, borrow one from the next column and turn the four into fourteen. Then do 14-8 which equals 6. Now, because you have borrowed on from the next column the number in the column you borrowed from is one less. So now it is 4-7 which again doesn't fit. So repeat the strategy about borrowing the numbers. Then subtract the next one, borrow the one and repeat. Then you have the answer. Did you find this helpful?
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Kia Ora Kate,
ReplyDeleteMy name is Nasteho I go to Hay Park school and I am in Tuffery class. I really like your blog post about subtracting using the column method. I learnt so much tricks and information of how to subtract in thousands. Was it hard? How do you know all that stuff?
Bye
Hi Nasteho, it wasn't that hard once you know the strategy. I have known this for a while but it helped having the teacher around to remind me. What are strategies you know?
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