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BEGINNERMental Math
Double-Half Multiplication
Simplify multiplication by doubling one number and halving the other
SSCIBPS
If one number is hard to work with, transform the problem!
Formula
A × B = (A×2) × (B÷2) = (A÷2) × (B×2)How It Works
0
Double the harder number
1
Halve the other number
2
Repeat until easy to calculate
Examples
📝 35 × 12 = 70 × 6 = 420
📝 25 × 16 = 50 × 8 = 100 × 4 = 400
📝 14 × 15 = 7 × 30 = 210
Pro Tips
💡 Keep going until one number becomes 1 or easy to multiply!
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