A calculator has these buttons:

Just like a “normal” calculator,

When you type 1 x 10, it says 10.

When you type 1 + 10, it says 11.

When you type 1 + 1, it says 10.

When you type 10 + 10, it says 100.

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**Using this information alone**:

How would you count from one to four?

What would the calculator say if you typed in 100 / 10 ?

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**Extending the pattern**:

Can you extend the pattern to count up to twenty?

What would the calculator say if you typed in 0.1 + 0.1?

What would the calculator say if you typed in 0.1 x 10 ?

What would the calculator say if you typed in 111 + 111 ?

What would the calculator say if you typed in 111 x 10 ?

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For the solution, click HERE.

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