RashStrumenti

    Abaco Online

    Impara il valore di posizione con un abaco interattivo a 5 righe. Prova la modalità gioco!

    Valore attuale

    0

    ×10,000
    ×1,000
    ×100
    ×10
    ×1

    Clicca una pallina per farla scorrere. Le palline spostate a sinistra si sommano al valore.

    Calcolatrici per le decisioni di tutti i giorni

    Calcolatrici rapide e precise — dall'IMC e i pagamenti dei prestiti alla matematica avanzata — che funzionano semplicemente nel tuo browser.

    Dalla matematica semplice ai calcoli avanzati

    Un set di calcolatrici pulito per le esigenze quotidiane: età, percentuale, matematica scientifica, pianificazione prestiti e metriche corporee — senza pubblicità o distrazioni.

    Prova questo strumento
    Dalla matematica semplice ai calcoli avanzati

    Calcolatrici pratiche per finanza e salute

    Pianifica prestiti auto, monitora l'IMC, stima i materiali per un progetto o calcola la zakat. Input pratici, output chiari, ottimizzato per dispositivi mobili.

    Apri Registratore Schermo
    Calcolatrici pratiche per finanza e salute

    Impara e pratica con strumenti interattivi

    Strumenti interattivi come l'abaco e i segnapunti rendono la matematica e i giochi più facili da insegnare, praticare e apprezzare.

    Apri Trasferimento File
    Impara e pratica con strumenti interattivi

    Guida passo-passo

    Come usare Pallottoliere Online?

    Esercitati con l'aritmetica mentale usando un pallottoliere virtuale interattivo con perline che scorrono con un clic.

    Istruzioni passo-passo

    1. 1

      Clicca o trascina le perline per rappresentare i numeri.

    2. 2

      Usa le guide di addizione e sottrazione per esercitarti.

    3. 3

      Resetta il pallottoliere a zero in qualsiasi momento.

    4. 4

      Prova esercizi guidati per aumentare la velocità.

    Vantaggi

    • Fisica delle perline realistica.
    • Perfetto per imparare le tecniche tradizionali del pallottoliere.
    • Migliora la matematica mentale e la concentrazione.
    • Gratuito e senza installazione.

    A chi è rivolto?

    • Bambini che imparano la matematica con il pallottoliere
    • Genitori che supportano i compiti di matematica
    • Adulti che migliorano l'aritmetica mentale

    FAQ

    Domande frequenti

    The tool is a browser-based virtual soroban that lets you set beads, perform arithmetic (addition, subtraction, multiplication, division), and run timed mental-math drills without downloading or signing up. To start, open the site and click the blue "New Problem" button, choose operation (Add/Subtract/Multiply/Divide) from the dropdown, set the number of rods in Settings (default 13 rods, range 1–20), then click digits on the board or type numbers with the keyboard to move beads and press Enter to check the result. You can toggle "Show Bead Labels" and "Highlight Carry" to see numeric hints while learning. Results appear in the right pane with an "Export CSV" and "Export PNG" option for saving practice logs or screenshots.

    Open Settings → Mode and choose "Tutorial (Soroban)" which walks you through bead values and the one-bead/four-bead rules using guided examples. The tutorial uses the "Show Finger Guide" toggle to animate exactly which bead to move and the "Practice" panels present 30 progressive exercises (single-digit to multi-digit carries). Use the "Hide Beads" option in Practice → Mental Mode to flash the configuration for 2–5 seconds and then hide beads to emulate mental calculation. Each step gives immediate feedback and stores your completion in localStorage so you can resume later.

    You can export practice logs via the "Export CSV" button; the CSV uses UTF-8, columns timestamp,problem,answer,time_ms and downloads as .csv (typically under 200 KB for ~2,000 rows). The board screenshot is exported with "Export PNG" which renders the HTML canvas to a .png file; on desktop Chrome/Firefox these are lossless PNGs around 30–200 KB depending on board size. There is also a "Save Session" button that writes a .json snapshot (session.json) including up to 5 MB of localStorage data; large histories over 5 MB will be trimmed automatically by the browser.

    The virtual abacus defaults to 13 rods but you can set 1–20 rods in Settings; numeric input is therefore limited to the number of rods (20 digits max). The calculator accepts integers and decimals (you can set decimal places 0–6 in Settings) and supports up to 15-digit precise integer arithmetic in the practice engine before it switches to BigInt-backed arithmetic for consistent results. You can queue up to 10,000 generated problems in a practice session; storing them in the session.json may push localStorage limits, so use Export CSV to archive large sets.

    If beads won't move, first verify JavaScript is enabled and disable any content blockers for the site—ad/tracker blockers sometimes block the in-page pointer library. If the board renders but clicks don't register, try toggling "Touch Mode" in Settings (this switches pointer events to touch events) or refresh the page and clear a stuck state with Settings → Reset Board. For persistent issues on Chrome/Edge, open DevTools (F12) and look for a console error mentioning "localStorage" or "pointer"; if localStorage is disabled (third‑party cookie settings), the site will fail to save practice state—allow site storage or use Export/Import session manually.

    On mobile the UI switches to a single-column layout and enables "Touch Mode" by default so dragging and tapping move beads; pinch-to-zoom on iOS Safari can interfere with dragging, so enable "Disable Pinch Zoom" in Settings if available. iOS Safari may kill background tabs during long drills; save your session with "Save Session" (downloads a session.json) before long speed runs. Also, using the site in Chrome on Android usually gives better memory handling for long sessions; Safari on older iOS (12–13) can show delayed animations because of stricter memory limits.

    The tool is free and requires no signup; practice state and scores are stored in your browser localStorage (up to ~5 MB for that origin) and are not sent to external servers by default. Exports (CSV/PNG/JSON) are generated client-side and downloaded to your device; if you use the optional "Share Result" button it will POST a one-time anonymous snapshot to the public paste endpoint and display a shareable URL, but that action is explicit and explained in the prompt. If you prefer absolute offline use, you can open the site while offline and the board will still work for manual bead movement, though cloud features like sharing won't be available.

    There are several keyboard shortcuts: number keys 0–9 set the selected column's bead value, Tab/Shift+Tab moves the column focus left/right, Enter checks the answer, R resets the current board, and S saves a session. The UI exposes ARIA labels for the rods and beads; enable "High Contrast" and "Large Beads" in Settings for better visibility. For screen-reader users, the "Readout" toggle will speak the current number and announce carries using the browser SpeechSynthesis API (works in Chrome/Edge/Firefox but requires user permission to play audio).

    Multiplication uses integer arithmetic with optional decimal places set in Settings (0–6 decimals). For non-integer division the practice engine performs Euclidean division when requested (quotient and remainder) and for decimal divisions it computes a decimal result rounded using bankers rounding to the configured decimal places; you can toggle "Truncate instead of Round" if you prefer simple truncation. Large multiplicands beyond 15 digits are computed with BigInt and the library will return exact integer results, but decimal precision is limited to 6 places to keep the drills educational and performant.

    Yes — use "Save Session" to download a session.json snapshot of the board, history, and settings; this .json file is about 5–200 KB depending on how many problems you have. Teachers can also click "Export CSV" to produce a .csv of timestamped problem/answer/duration rows that imports cleanly into Google Sheets or Excel. For quick sharing, the "Share Result" button will create a temporary public report (URL expires after 7 days) containing your top 10 times; use Export CSV for permanent records because the temporary URL is not guaranteed long-term.

    The online soroban mirrors bead movement and value rules of a physical soroban and has advantages like instant random problem generation, undo/redo, and visual carry highlighting that a physical abacus lacks. Compared with desktop calculator apps (Excel, Python), the tool emphasizes kinesthetic learning and mental visualization rather than raw numeric computation; exports to CSV let you analyze times in Excel but the site itself doesn't replace scriptable batch math. If you need batch high-precision math or complex statistics, use Python/Excel; use this tool for method learning, timed drills, and speed calculation practice.

    Use the "Practice → Mental Mode" which flashes the bead configuration for 1–3 seconds and then hides beads so you practice visualization; start with 3 rods and increase rods only when you hit consistent accuracy. Enable "Highlight Carry" and "Show Finger Guide" during early learning sessions and then disable them to build independence; export your session CSV weekly and chart time_ms to see real progress. Finally, practice with the keyboard shortcuts (numeric entry and Enter to check) to simulate noisy classroom conditions where mouse dragging is slower.

    Informazioni su questo strumento

    Esercitati con la matematica mentale su un soroban giapponese virtuale

    Il soroban — il moderno abaco giapponese — è stato uno strumento didattico per oltre un secolo perché rende visibili il valore posizionale, i riporti e i prestiti in un modo che le calcolatrici non potranno mai fare. Questo soroban online ti offre 13 colonne di perline che puoi cliccare per spostare, con il totale corrente visualizzato in alto.

    Ogni colonna ha una perlina del cielo del valore di 5 sopra la barra di calcolo e quattro perline della terra del valore di 1 ciascuna sotto di essa. Spingi le perline verso la barra per contare e lontano per sottrarre. È un modo pratico per sviluppare il senso dei numeri per bambini e adulti.

    Strumenti correlati