Ten, 10, is a two-digit number made of 1 and 0.

100 is a three-digit number: 1, 0, 0

1000 is a four-digit number: 1, 0, 0, 0

Don't worry about big numbers or decimal numbers! We only operate on two digits at a time! There are only 10 digits to operate on.

There are 4 Operations or actions on numbers:

1. Addition + is combining same things. (add, addition, sum, combine, altogether, gather, aggregate, more...+)

2. Subtraction is taking away (minus, reduce, drop, lower, below...-).

3. Multiplication is adding the same thing more than once. (Multiply, times, multiple, repeatedly, repeat...× ( ) * ·).

4. Division is repeated subtraction (divide, share fairly, distribute, fracture, break, divi up, split into equal groups...

   / ÷ 厂 1 ).

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