Tag: digit-tricks

Interview Questions

• The times-11 trick on a three-digit number
• Multiply 356 × 1001 in your head
• Multiply 44 × 46 in two glances
• Multiply 63 × 67 with the "units add to 10" trick
• Multiply 63 × 99 with a digit pattern
• Multiply 72 × 11 without pen and paper
• Multiply 74 × 101 by inspection
• Square 305 with the ends-in-5 shortcut
• Square 45 instantly
• Square 53 using the number nearest 50
• Square 75 in your head