數學練習 · 全新體驗
Interest
把Interest變成一場你真心想贏的對決。每一道題都是一次攻擊——比對手更快解出，就能命中對方。
4–99+ 歲皆宜 · 免下載 · 直接在瀏覽器中遊玩 · 23 種語言
玩法說明
Interest
選一名鬥士，挑選Interest，相信你的算術。解得越快、越準，出拳就越重——從輕鬆的低年級題目，一路挑戰到奧林匹亞等級。
Interest is what money earns for being lent out — or costs for being borrowed. Simple interest is the straightforward version: the same amount is earned every single year, because it is always worked out on the ORIGINAL sum.
Three things decide it. The principal P is what you started with. The rate r is the percentage earned per year. The time t is how many years it sits there. Multiply all three: I = P × r% × t.
Put £400 in at 5% for 3 years. Five percent of 400 is 20, so it earns £20 each year, and over three years that is £60. That is the interest — the account now holds £460, but the question asked what it EARNED, not what it holds. Read carefully which one is wanted.
Real bank accounts usually pay compound interest, where each year's earnings start earning too, so the total creeps ahead of this. Simple interest is the honest first model, and it is still exactly how many loans are quoted.
Find one year's interest, multiply by the number of years, and type the total interest earned.
Interest的所有關卡
— 快問快答 —
Interest：精簡 FAQ
- Interest可以免費玩嗎？
- 可以。Interest在瀏覽器裡就能免費暢玩——課程全部開放，免下載、免註冊。付費方案之後才解鎖完整鬥士陣容、全部舞台與進度保存。
- Interest適合誰玩？
- 4 到 99+ 歲的任何人。低年級對新手依然平緩，更高的難度則連有自信的玩家也得冒汗。
- 玩Interest需要下載什麼嗎？
- 不需要。Interest在任何瀏覽器裡都能跑，筆電、平板或手機都行。
- Interest能在課堂上用嗎？
- 當然可以。老師帶一整班玩Interest，還能追蹤誰在進步——按學生人數計價與教師儀表板，詳見學校方案。