“$0.819$,” said the Mathematical Ninja, in as weary a voice as the student used to say “I suppose you’re going to tell me how.”
The nunchaku looked a little rusty, and the axe was in need of a good sharpening. The throwing knives could have done with a clear, and the broadsword… well, once upon a time, it would have been a point of pride to have not a spot of blood on it.
“Interpolation!” said the Mathematical Ninja, a little bit glumly. Christmas was coming, and Christmas meant having to hang out with the Ninja family rather than do Ninja maths.
“Go on…” said the student.
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