By using some incorrect procedure. Common "tricks" are division by zero, equating the negative and positive square roots.
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Any number whose sum of its digits are equal to a multiple of 3, is divisible by 3. In this instance, the sum of the digits of the number 34215 is equal to 15, which is divisible by 3, and therefore the number is divisible by 3.
5
Any number multiplied by one is equal to that number. Therefore, 2/3 x 1 is equal to 2/3.
yes 6
The fewest number of pieces he needs of each kind of sub sandwich to make them equal is three. He will need three pieces of each sub sandwich to make them equal. 3 pieces of turkey 3 pieces of roast beef 3 pieces of ham