SKY LEDGER
The sky is the coordinate plane. Falling stars carry ledger lines; work one out, dial its station on the astrolabe, and it snaps home and blooms. Chain the blooms before the light fades and the observatory writes the whole watch down.
Addition & subtraction
The pack suggests age 7 and up. The difficulty itself follows the player, not the age.
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What it covers
SKY LEDGER 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