10 20 30 40 50 60 70 80 90 100. That’s how we do it
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That means to add 10 at a time. The result is 10, 20, 30, 40, etc.
It is only because we count in tens - and 5 10 and 2 are factors.
ok i get this
There are 8 10s in 85, with 5 left over.
600
it originated in Roman times, the Latin word for 10 is deci, so everything used to be divided up in 10s, which was the easiest way to measure and count. ( fingers and toes for example)