THE COIL OF NINETY-SIX
An articulated brass coil is a number written in place value. Shear off the glowing number — crack a link open when the ones run short — and the machine performs the arithmetic in front of you.
Addition & subtraction
The pack suggests age 6 and up. The difficulty itself follows the player, not the age.
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What it covers
THE COIL OF NINETY-SIX draws its questions from these parts of the curriculum. Which of them a player sees, and how hard the questions are, follows the player.
Addition & subtraction
- Column addition without regrouping
- Column subtraction without regrouping
- Multi-digit addition with regrouping
- Multi-digit subtraction with regrouping
- Adding a short addend with regrouping
- Subtracting a short subtrahend with regrouping
- Subtracting across zero