  Math Central - mathcentral.uregina.ca  Quandaries & Queries    Q & Q    Topic: last digit   start over

9 items are filed under this topic.    Page1/1            Units digit 2014-01-03 From gracie:9^23 units digitAnswered by Penny Nom.     The units digit 2012-09-11 From Shaunice:Simplify each of the following expressions and determine what the last digit would be. a. (24^15) 4Answered by Penny Nom.     Units digit 2009-07-23 From Jyll:How do solve for the units digit? And that, what is the units digit of the first 1000 prime numbers?Answered by Robert Dawson.     The units digit of 2^95 2009-03-18 From Sharvon:what is the units digit of 2^95Answered by Robert Dawson.     The 2 rightmost digits 2008-12-18 From Peter:Is there a pattern for the 2 rightmost digits of a power? For example, one problem for a math competition was what are the 2 rightmost digits of 3^1993?Answered by Robert Dawson and Victoria West.     n^2+n-1 has no divisors ending with 3 or 7 2005-09-08 From Arne:at least it seems like for any integers n and k, 10k+3 and 10k+7 do not divide n²+n-1 I tested this for every n from 0 to 3200 (which means same for the numbers from -3201 to -1) could this be true, or is it just coincidence, or am I just totally wrong?Answered by Richard McIntosh.     The last digit of a large exponent 2004-10-20 From Landon:How can one determine the last digit of a large exponent by hand. I have seen several examples of how to do this by breaking it up into smaller exponents, but is there a formula or some common things to look for?Answered by Penny Nom.     The last digit of 2^28 2004-09-25 From A student:I am currently enrolled in a math reasoning class and a math question I have to answer is determine the units digit in 3 28power. When I set up a table and keep cubing the numbers, I find a pattern with the last digits of the numbers that follow 1,3,9,7. My calculator gets to about the 19th power, and then I get an error. If I continued the pattern, would the units digit then be the last digit of 3 28th power, which would be a 7? Please let me know if I am solving this correctly and what a unit's digit actually is.Answered by Penny Nom.     The units digit of 57 to the 28th power 2003-09-01 From Maria:If 57 is raised to the 28th power, what must be the units digit in the result? If you raise 7 to the 500th power, what is the numeral that will appear in the units digit position?Answered by Penny Nom.      Page1/1    Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.    about math central :: site map :: links :: notre site français