Number Base Mental Arithmetic

• Free online number base mental arithmetic training tool. Practice conversions between binary, octal, decimal, and hexadecimal number systems
• Random questions, instant feedback, and accuracy tracking to help you master base conversions quickly

1. Open the tool page — no installation needed
2. Select the bases to practice (at least two), choose the difficulty, number of questions, and whether to show answers immediately, then click "Start Training"
3. Type your answer for each question and click "Submit Answer"; you'll see right/wrong feedback instantly, then click "Next Question" to continue. When finished, view your "Results" (score, accuracy, time) and use "Restart" or "Reset" to practice again

• This tool is completely free and requires no sign-up
• All questions and scoring run locally in your browser — your data never leaves your device

Free online number base mental arithmetic training tool. Practice conversions between binary, octal, decimal, and hexadecimal number systems. Random questions, instant feedback, and score tracking to help you master base conversions quickly.

Open the tool page — no installation needed Select the bases to practice (at least two), choose the difficulty, number of questions, and whether to show answers immediately, then click "Start Training" Type your answer for each question and click "Submit Answer"; you'll see right/wrong feedback instantly, then click "Next Question" to continue. When finished, view your "Results" (score, accuracy, time) and use "Restart" or "Reset" to practice again

This tool is completely free and requires no sign-up All questions and scoring run locally in your browser — your data never leaves your device

Yes, Number Base Mental Arithmetic is completely free. No download or installation required — it runs right in your browser.