A short multi-speaker YouTube lesson (presenter Hannah among others) demonstrating how to multiply whole numbers by 10, 100, and 1000 using place-value sliders/tables and placeholders. The video emphasizes conceptual understanding (moving digits left by place value) and cautions teachers to avoid the phrase 'add a zero' because it misleads with decimals. Concrete examples shown: 6×10=60, 6×100=600, 6×1000=6000, and 807×10=8070.
Chapters
Hi, I'm Hannah, and in this video.
We'Re going to look at how to.
Multiply by 10, 100 and 1000.
It's really important that your pupils have.
An understanding of why what they do works. And this comes from having a really deep conceptual understanding. One way to support them with learning about multiplying by 10, 100, a thousand.
Is to use a place value slider.
This is because they can move it from left to right as they divide and multiply.
So let's have a look at multiplying 6 by 10.
It's a really good idea to lay.
Out your work in a place value table.
This is because it shows your pupils.
The value of each digit.
So we have a six in the.
Ones column as it represents six ones. So what's going to happen when we.
Multiply it by 10? It's a good idea to ask your.
Pupils what they think is going to happen.
First of all, so our six is.
Going to move one place to the left to the tens column. This is because the tens column is.
10 times greater than the ones column.
We then need to remember to put.
Our place value holder.
So 6 multiplied by 10 is 60. It's really important that you're careful with.
Your language as you don't want to.
Encourage children to have misconceptions.
For example, avoid saying add a zero, as this will cause them problems when.
They start multiplying decimals. So how can we multiply six by 100?
Well. Well, we're going to move our six once into the tens column and then again into the hundreds column.
This is because the six in the.
Hundreds column is 100 times larger than the ones column.
So now we need to remember to.
Put in our placeholders.
So 6 multiplied by 100 is 600.
So now what happens when we want.
To multiply 6 by 1000?
If your pupils had developed an understanding.
That each column to the left is.
10 times greater than to the column directly to the right, then they should be able to understand that we're going.
To multiply it once, twice, and three.
Times by ten, meaning that our six.
Ends up in our six thousands column.
We can then put our place value.
Holders in, which means that 6 multiplied by 1000 is 6000. We can use this method with larger.
Numbers and decimals as well because our.
Place value columns always have the same relationship.
So, for example, if I was multiplying.
807 by 10, all my digits would move one place to the left, so.
It would become 8070. So that is how you can multiply by 10, 100 and 1000.
