![]() ![]() There are two single-digit numbers, one condensed from the first operand and the other condensed from the second operand. Repeat steps one and two with the second operand.If the resulting sum has two or more digits, sum those digits as in step one repeat this step until the resulting sum has only one digit.Sum the digits of the first operand any 9s (or sets of digits that add to 9) can be counted as 0.Methods and techniques Casting out nines Īfter applying an arithmetic operation to two operands and getting a result, the following procedure can be used to improve confidence in the correctness of result: ![]() 5 Memoriad – World Memory, Mental Calculation & Speed Reading Olympics.3 Mental Calculations World Championship.2 Mental arithmetic as a psychological skill.1.8 Approximating common logarithms (log base 10).1.7.2 Extracting roots of perfect powers.1.6.5 Squaring an integer from 26 to 74.1.6.4 Squaring numbers very close to 50. ![]()
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