It is an odd number
It is a Prime number
It is a rational number
It is an irrational number when square rooted
It is V as a Roman numeral
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It's an even number It's a rational number It's a composite number Its prime factors are 2, 5 and 7 It's the product of 7 and 10 It's LXX in Roman numerals
It is a triangular number In Roman numerals = XXI It is the sun of the first 6 numbers (1+2+3+4+5+6=21)
There are many mathematical facts about the number 55, although some of them are not all that interesting. The number 55 is an odd number, it is evenly divisible by 5, it is 45 less than a hundred, it is a two digit number; 55% of the vote is a majority, some people retire at the age of 55 (and there is a TV commercial advising people to do so, with the help of a certain brand of financial planning). The integer 55 comes immediately after 54, and before 56. Many more facts could be found.
1. 1+9=10 2. 2+8=10 3. 3+7=10 4. 4+6=10 5. 5+5=10
2n + (-5)