Build your speed
Master two digit sums
Master single digit sums
Memorize Cubes & Roots
Learn the Prefix Sum method
Divide numbers by divisors near 10, 100, 1000.
Practice Multiplication Tables from 1 to 20
Multiply any 2-digit number by 11 instantly.
Sum digits in groups of 3
Master multiplication with 99
Master multiplication with 999
Master multiplication with 9999
Multiplication of numbers with a series of similar digits
Move decimal 2 places left
Move decimal 1 place left
Find 1% and double it
Double of 10% or Divide by 5
Half and Half again (Div by 4)
Half of 10% or Divide by 20
Just half it (Divide by 2)
Core method: Move decimal + Multiply
x% of y = y% of x
Memorize Squares & Roots
Universal trick for 11-99
Square numbers between 40 and 50 instantly using the (15 + units) trick!
Master the trick to square any number between 50 and 60 instantly!
Trick to square any number ending in 5 in seconds!
Base 100 Trick
Master two digit subtraction
Master single digit subtraction
Like 43 x 47 or 62 x 68
Daily Tip: Practice is the key to mental math mastery.