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Place Value Chart
Counters, base ten blocks and arrow cards — the same number, three ways, at the same time. Put ten in a column and exchange them for one in the column to its left, which is the whole idea of place value in one move.
The number
0
zero
Make this number
A column with ten or more in it is ready to exchange — press its Exchange button.
Tap a counter to exchange it for ten in the column to its right — the swap you need for taking away.
Blocks show the whole-number part: thousands, hundreds, tens and ones. Anything after the decimal point is shown by the counters and the arrow cards.
Each card holds one part of the number. Slid together they make it.
Using it in class
Exchanging is the lesson
Put ten counters in the ones column and the column lights up. Press Exchange and the ten slide out and one appears next door. That single move is what place value is, and it is much easier to see than to say. It waits for you by default so you can ask the class what should happen first.
Three views, one number
Counters, blocks and arrow cards are usually three separate tools. Here they are three tabs on the same number — change it anywhere and all three follow, so a child who has only ever seen one of them can be shown how the others say the same thing.
And it reads it out
Every number is written underneath in words — four thousand and seventy, not "four thousand seventy" — which is where the zeros in the middle of a number stop being mysterious. Goes down to thousandths for upper key stage 2.
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