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Write down the number $4$, four times.
Put operation symbols between them so that you have a calculation.
So you might think of writing $4 \times 4 \times 4 - 4 = 60$
Now, can you redo this so that you get $15$, $16$ and $17$ for your answers?
Need more of a challenge? Try getting answers all the way from $0$ through to $10$.