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

Updated: 9/14/2023

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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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### What is the only unknown number palindrome?

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

### What is the mathematical meaning of palindrome?

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

47 + 74 = 121

### How many prime numbers are there whose square has 5 or 6 digits?

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.

### Why is there ten digits in the base ten system?

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.

### What is the largest number of eight digits with one of its digits 0 and remains the same when its digits are reversed?

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

### Is 1.320 less than 1.302?

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.

### What five digits number when you multiply by four is the same the number when you reversed it?

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

### What is the most easy way to memorise multiplication facts?

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.