Working-base multiplication — Vedic maths trick

The trick

Anurupyena — “proportionately”

1. Pick the working base (like 40 = 4 × 10 or 300 = 3 × 100) and write each number’s difference from it.
2. Cross-add as in trick 3, then multiply that left part by 4 (or 3, 5…).
3. Right part: multiply the differences — 1 digit for a × 10 base, 2 digits for a × 100 base (carry the extra).

Use it for: Both numbers near the same round number: 20, 30 … 90, 200, 300, 400, 500, 600.

Worked example: 48 × 46 = 2208

✏️ Practice

Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.

🏁 Trick 15 test

20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.

🏅 Sign in with Google to earn the 🏗️ Base Builder badge when you pass — and a certificate when you finish all 10 tricks of Part 2 · Advanced tricks. You can still take the test without signing in.

🖨️ Working Base Multiplication Worksheet

• Worksheet set 1 (PDF)
• Worksheet set 2 (PDF)
• Worksheet set 3 (PDF)