Q: What number has 3 digits that are all the same and is 100 less than a number whose digits add up to 10?

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A palindromic number is a number whose digits, with decimal representation usually assumed, are the same read backwards, for example, 58285.

It is number whose digits read the same from left to right and from right to left. For example, 18645254681.

solution: we know that there are 25 prime numbers are between 1-100 and 168 prime numbers less than 1000. 100 x 100=10000(5 digits) 999 x 999=998001(6 digits) 1000 x 1000=1000000(7 digits) so our answer should be same as the number of prime numbers between 100 to 999. hence, 168-25=143. 143 prime numbers will be there less than 1000 whose square has 5 or 6 digits.

In any system of counting, there are exactly the same number of digits as the base. They go from 0 to one less than the base.

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33

11

A palindromic number is a number whose digits, with decimal representation usually assumed, are the same read backwards, for example, 58285.

It is number whose digits read the same from left to right and from right to left. For example, 18645254681.

47 + 74 = 121

solution: we know that there are 25 prime numbers are between 1-100 and 168 prime numbers less than 1000. 100 x 100=10000(5 digits) 999 x 999=998001(6 digits) 1000 x 1000=1000000(7 digits) so our answer should be same as the number of prime numbers between 100 to 999. hence, 168-25=143. 143 prime numbers will be there less than 1000 whose square has 5 or 6 digits.

In any system of counting, there are exactly the same number of digits as the base. They go from 0 to one less than the base.

An eight digit number with one zero cannot remain the same when its digits are reversed. It must have an even number of 0s.

Since the numbers have the same number of digits, just compare the digits one at a time, from left to right, until you find one digit that is greater in one number than in the other.

five digits number when you multiply by four is the same the number when you reversed it is 21978*4 = 87912

Remember the commutative property of multiplication: 4 x 2 is the same as 2 x 4. The number of digits in a product can not exceed the number of digits in the multiplier and multiplicand: the product of 23 X 234 is five digits or less.