## Thursday, 1 June 2017

### Numbers under the pattern - the kids take control

I followed up the previous task (Numbers under the pattern) by handing over a bit to the kids.

Rather than use patterns that I had made, I gave them blank 5x5 grids and asked them to create their own number patterns, then cover them using the coloured cubes as before.

They could start at any number and count up by any number.

And they did.

Here are a few examples of counting patterns these guys chose, some recognising that a calculator is a great tool for this purpose:

- Counting by 17 pattern:

- Counting by 260 pattern:

- Counting by 562 pattern

- Counting by 8476 pattern:

- Starting at 193 and counting on by 162:

This was pretty good stuff from Year 2 kids. So good that they didn't actually get to the other part of the activity, that was placing the coloured cubes on their patterns.

Kids who chose a simpler number pattern for their grids did however move forward to the next part.

Here is what we found:

- If you start with even numbers and then add on even numbers, you end up with some pretty vertical looking patterns.

- If you use odd numbers, you are likely to find some sort of grid pattern - maybe odds and evens.

Can you guess which pattern might have only even numbers and which might involve odd numbers?

So...top pattern is counting by 2's and is only even numbers.
Bottom pattern is counting by 5's.
This student is looking at the pattern made by the digits in the units column.

And again - can you make a prediction about what you might find under the pattern?

So, my guess for this one is that it is something to do with odd numbers.

And I was correct. This student decided to count by 10's, putting down a yellow cube if the 10's digit was odd, blue if the 10's digit was even and red if the 10's digit was 7 or 9.

And then we had this one:

Any ideas? Then let me show you a few numbers...

Hmm...counting by 7's....

Yep - when you count by 7's, the units make a pattern that repeats after each 10th number in the series.

I wonder if that works for other numbers?

I wonder if it works for every number or just for odd numbers?

I wonder....