
Alright then, we've been messing around here making abacus(es) (abaci?) using beads, kebab sticks, and tongue depressors.
The first ones we made were traditional and had the "heaven" and "earth" beads and all of that. Which was cool.
However I also recently made a simpler version, which is great for anyone learning math facts for both addition and subtraction.
I just put ten beads, in alternating colors (so you can see even vs. odd numbers) on each level. Then I labeled each decimal place. The kids wanted to go up to millions so that's how many we did.
The cool thing about using this one is that often when you add you also get to subtract.
Example: Suppose you've moved over 5 beads in the bottom rung. You want to add 8 to that.
Well, you haven't got 8 more beads to add. So what do you do? Go up a rung and add 10, then go back down and subtract 2. That's it. Then you've got one bead in the 10's place and 3 in the 1's place. Or 13.
You can do that all up and down the various decimal places.
I'm liking this one for my kids since they're in math-fact-learning mode. And it teaches things in decimals which is useful for how our numbers work.
Anyway it's worth a try. I kind of like just messing with it while I have breakfast.







