白頭翁隊長帶單車隊環島，每一段路要平分給隊員接力騎。孩子用直式一位一位除：用 ▼ ▲ 選出每一位的商，畫面會長出乘積和餘數，每除對一位，車隊就往前騎一段。除到個位還有餘數時，從工具盤把「0」拖到被除數後面繼續除；除到小數點時，把「.」拖到商上，對齊被除數的小數點。第 1 關是整數除以一位數、商是小數（13 ÷ 4 = 3.25），第 2 關是小數除以整數（12.6 ÷ 3 = 4.2），第 3 關除不盡，要多除一位再決定四捨五入（10 ÷ 3 = 3.33… ≈ 3.3）。
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「小數除法（商是小數、除不盡取概數）」。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：13 公里的 13 可以想成 13.0、13.00，補 0 不會改變大小，所以可以一直除下去。四捨五入到小數第一位，要先算到小數第二位才知道要不要進位。
Captain Bulbul’s cycling team rides round the island, and each stretch is shared equally between riders. Children divide digit by digit: they pick each quotient digit with ▼ ▲ and the products and remainders appear, while the team rides one step on per correct digit. When there is a remainder after the ones, they drag a “0” from the tray onto the dividend and keep dividing; at the decimal point they drag a “.” into the quotient, lined up with the dividend’s point. Level 1 divides whole numbers with decimal answers (13 ÷ 4 = 3.25), level 2 decimals by whole numbers (12.6 ÷ 3 = 4.2), and level 3 never comes out exactly, so they divide one place further and round (10 ÷ 3 = 3.33… ≈ 3.3).
Suits Grade 5 (about age 10–11) in Taiwan. Taiwan curriculum (12-year basic education) unit: Dividing decimals (decimal quotients, rounding when it does not divide evenly) (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.