In the 1800s.
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Cuisenaire and they are called rods and base 10 if white is one.
You can give coins in exchange for goods: not many shops will accept base ten blocks! Also, base ten blocks come in powers of ten, coins have all sorts of other values: 2, 20, 25, 50 - depending on the currency.
meters
Oh, dude, dividing 182 by 14 with base-ten blocks is like playing with Legos for grown-ups. You just group the blocks into sets of 14 until you run out of 182 blocks. It's basically like sharing your candy with 14 friends, but with math.
60 tens, 2 ones