Mix Mountain — Lesson 69: Game time: Tortoise and Rabbit Sums
Mix Mountain test →Lesson 69: Tortoise and rabbit sums: an abacus column sums game
Level 5, Mix Mountain. Three numbers, one line at a time. Every right line is a step for PlayType.
What your child does, card by card
Game time: Tortoise and Rabbit Sums. Slow and steady wins! PlayBuddy opens the lesson: “Game time! Let's play with the beads!”
Game time: Tortoise and Rabbit Sums fills the lesson window. 4 column sums (5 + 6 + 7, 13 - 6 + 8, 7 + 7 - 9 and 16 + 8 - 7) are worked one line at a time on the abacus below; every right line is a step for PlayType. The rabbit dashes ahead and naps, so steady work wins.
Slow and steady! Tortoise and Rabbit Sums is on the Games page too.
What this lesson trains
Column sums, the way the abacus works them: each line is added to the beads already there, with whatever friend it needs, and the beads are never cleared in between. The same race is free on the Games page with new sums each time.
Fingers and hands
During the race the game’s own abacus and the column sum take the hands’ place in the lower window.
What PlayBuddy and PlayType say
PlayBuddy: “Don't clear. The beads keep the answer.”
Stars
A finished round earns the lesson’s stars; a miss costs nothing.