## Thursday, October 17, 2013

### Tutorial: Roll-up Felt Hundred Mat

We have a laminated cardstock hundred grid that works with our number tiles, and I've recently realized that I can make some sturdy yet disposable hundred grids pretty easily from cardboard record album covers, but I was also wanting a hundred grid that would look nicer longer, and be easier to toss in my backpack for trips to the library or park to do schoolwork.

You make this hundred mat around the number tiles that you already own, so first you've got to make them. We have a set of clear one-inch number tiles that were great for matching to a printed hundred grid when the kids were littler, but now that they're older (AND have lost a couple of those tiles, sigh), I've made them a couple of sets of upcycled cardboard number tiles that are the same size, so they can be interchangeable. I've long wanted to make a set of number tiles out of Scrabble tiles, but I think their inevitable loss might break my heart, so...

Measure out the grid AROUND the tiles, so that when your kiddo puts a number tile on the grid, they'll still be able to see the border around the tile. A little extra space is always good for those fumbly kid fingers, anyway. For me, this meant measuring at one inch + 1 centimeter, and I still did a lot of double-checking:

Notice that I measured and drew this grid in chalk. I didn't end up making a mistake in my measuring, but if I did--chalk equals second chances!

When you've got the grid drawn out, get out a tiny paintbrush and some fabric paint, and carefully paint over your grid:

And that's it! You can roll up your mat, you can wash it, and you can play with it on the carpet:

I remember when Syd was first learning how to find numbers on the hundred grid, and now we're using it for multiplication and division. Ah, time...