The Enchanting Arithmetic by Sridharan R

Author:Sridharan R [R, Sridharan]
Language: eng
Format: epub
Publisher: AB Publishing House, Sydney
Published: 2011-04-10T04:00:00+00:00

when the number is divided by 10 the remainder is 9

(6.23) The number 381,654,729 is a special number in which the number formed by the first two digits from left side onwards is divisible by 2, the number formed by the first three digits is divisible by 3 and so on until the entire nine digit number is divisible by 9.

(6.24) The number 27,216 is divisible by 2, 7, 6, 27, 72, 21, 16, 162 and 216. All these numbers are in the given number.

(6.25) If the number of digits in a number is six and the number is divisible by 7, then the new number formed by shifting the unit digit to the extreme left is also divisible by 7.

For example 251,734 is a six digit number and is divisible by 7. So the number 425,173 is also divisible by 7. That is 425,173÷7 = 60,739

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