The two numbers that have a tens digit that is eight more than the ones digit are 80 and 91. Note that there are some larger numbers that also exhibit this pattern, such as 180, 280, 191 or 291.
The ones digit and tens digit are both examples of place values. Each column in a number to the left or right of the decimal has a place value. If there is a one in the tens column, it represents one set of 10. Likewise, if there is a two in the hundreds column, it represents 2 sets of 100, or 200 total.
Learn MoreThe prime factorization of 56 is 2 x 2 x 2 x 7. Both the prime numbers 2 and 7 divide 56 without leaving a remainder.
Full Answer >In the third grade, compatible numbers are estimated figures that are used to make mental arithmetic simpler. Compatible numbers are very close to the actual numbers and yield a similar result with less work.
Full Answer >Greek mathematician Heron of Alexandria is credited with having first conceived of imaginary numbers about the time of Christ, but it was Rafael Bombelli who first described the rules for the use of complex numbers in the late 16th century. At this early period of history, complex numbers were not well understood, with many mathematicians viewing them as useless.
Full Answer >In mathematics, the short word form is created by writing a large number using a combination of numbers and words. For instance, the short word form of 785,000 is 785 thousand.
Full Answer >