花園有 1 到 48 號花圃，藍鵲從 0 號的鳥巢出發，每次跳一樣的格數，停在哪裡就在哪裡種一朵花，所以花開的地方就是倍數。第 1 關先猜藍鵲第幾次會停在哪一格，或從已經開的花找出牠每次跳幾格；第 2 關兩隻藍鵲一起種花，兩隻都停過的地方開出雙色花（公倍數），孩子要猜第一朵雙色花（最小公倍數）開在哪裡，或替小藍鵲決定跳幾格；第 3 關花圃上有樹，藍鵲剛好停在樹上的跳法就是因數，遊戲會把成對的因數寫成乘法（3 × 6 = 18），兩棵樹都停到的就是公因數，最後找出最大公因數。
適合年級：五年級（約 10～11 歲）。對應 108 課綱（十二年國教）數學單元：五年級「因數、倍數、公因數和公倍數」。各版本教科書的單元順序不同，完整對照請看國小數學課綱對照表。免費、無廣告、不用註冊，手機、平板、電腦打開就能玩，題目有注音，也會念出來。
陪玩小提醒：找因數時，可以一對一對找（1 和 18、2 和 9、3 和 6），找到兩個數越來越靠近就找齊了。公倍數可以從大的數的倍數裡，找第一個也是小的數的倍數。
The garden has plots 1 to 48. A blue magpie leaves its nest at 0 and makes jumps of the same size, planting a flower wherever it lands, so the flowers show the multiples. Level 1 asks where the magpie lands on a given jump, or how far it jumps from the flowers already planted. In level 2 two magpies plant together and two-colour flowers open where both land (common multiples): children guess where the first one opens (the lowest common multiple) or choose the little magpie’s jump. In level 3 trees stand on some plots: jumps that land exactly on a tree are its factors, shown in pairs as multiplications (3 × 6 = 18); jumps that reach both trees are common factors, and children find the greatest one.
Suits Grade 5 (about age 10–11) in Taiwan. Taiwan curriculum (12-year basic education) unit: Factors, multiples, common factors and common multiples (Grade 5). Free with no ads and no sign-up, in Traditional Chinese with zhuyin and in English, read aloud. See the Taiwan elementary maths curriculum map.