The number of days in the months April, June, September and November (and in unusual circumstances February—see February 30). Although the number of days in a month vary, 30 is used to estimate …

Noun 1. 30 - the cardinal number that is the product of ten and three thirty, XXX large integer - an integer equal to or greater than ten Adj. 1.

The meaning of THIRTY is a number equal to three times 10. How to use thirty in a sentence.

Aug 1, 2025 · Free online math calculator to add, subtract, multiply and divide positive and negative numbers. Online decimal calculator to find sum, difference and products of numbers.

Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

30 is the first sphenic number, that is the smallest number with 3 distinct prime divisors 30 is the largest number with the property that all smaller numbers relatively prime to it are prime.

30 is a positive integer that comes after 29 and before 31. It is an even number and it is also considered a composite number, meaning it can be divided evenly by numbers other than 1 or itself. Notably, it …

30 is the index number for Fibonacci number, F 30 = 832040 = 5∗11∗23∗31∗61 = the largest Fibonacci number with 6 digits. 30 is the smallest integer with three distinct prime divisors.

Jan 29, 2016 · As Roman Numerals, the number 30 is XXX. A 30-week-old child in the womb has 20/400 vision and can only see right in front of them when they open their eyes, which won’t be very …

Properties of 30: prime decomposition, primality test, divisors, arithmetic properties, and conversion in binary, octal, hexadecimal, etc.