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BEGINNERMental Math
Multiply by 9 Using Fingers
Use your fingers to multiply any single digit by 9
SSC
Hold up all 10 fingers. To multiply N × 9:
How It Works
0
Hold up 10 fingers
1
Put down finger number N (from left)
2
Fingers to left = tens digit
3
Fingers to right = units digit
Examples
📝 7 × 9: Put down 7th finger → 6 fingers left, 3 right → 63
📝 4 × 9: Put down 4th finger → 3 fingers left, 6 right → 36
Pro Tips
💡 Also works: N × 9 = (N-1) followed by (10-N)
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