Mental Math

Speed Multiplication

Multiply large numbers close to bases in seconds using beautiful multiplier patterns.

Lessons included in this chapter:

• Double Twice (×4 & ×8): undefined
• Multiplier 11 Pattern: undefined
• Multiplying by 9 & 99: undefined
• Multipliers Near 10 (×12, ×13, ×15): undefined
• Quarter Scaling (×5, ×25, ×125): undefined
• Duplication Patterns (×101 & ×1001): undefined
• Missing Factor Equations: undefined