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	More on the last 2 digits of a^k = N		2020-08-07
		Jay pose la question : I've seen solution methods for finding the last 2 digits of a^k = N, where a and k are known. My question is: What if the number N is known and the last 2 digits are, say, ...62. Is there a way to find, for any given a, the value of k which will result in a number where the last 2 digits are ...62? and if that is possible, then do the same for a number with the last n digits (say 7 or 53 or something)? Harley Weston lui répond.
	The last two digits of a phone number		2016-04-03
		Joshua pose la question : I want to find the last two digits of a phone number whose first eight numbers of a ten digit phone numbers are known. Penny Nom lui répond.
	Units digit		2014-01-03
		gracie pose la question : 9^23 units digit Penny Nom lui répond.
	A label to cover a plastic cup		2012-10-23
		Kevin pose la question : I'm trying to make a label to cover the entire outer area or a plastic cup. I know there must be a way to figure out the dimensions needed, but I can't seem to figure it out. The circumference of the bottom of the cup is 21.4cm and the circumference at the top of the cup is 29.8cm. The cup is 14.5cm tall. What should the height of the arc from the plane connecting the two ends of the 21.4cm arc. I attached a diagram where x is the value I'm looking for. I'm guessing there is some simple relationship between the length of a line and the arc needed to turn that line into a perfect circle, but I don't know what it is. Can you figure this out and share it with me? Thanks. -Kevin Penny Nom lui répond.
	The units digit		2012-09-11
		Shaunice pose la question : Simplify each of the following expressions and determine what the last digit would be. a. (24^15) 4 Penny Nom lui répond.
	A snail on an elastic band		2010-02-03
		Joe pose la question : A snail starts crawling from one end along a uniformly stretched elastic band. It crawls at a rate of 1 foot per minute. The band is initially 10 feet long and is instantaneously and uniformly stretched an additional 10 feet at the end of each minute. The snail maintains his grip on the band during the instant of each stretch. At what points in time is the snail (a) closest to the far end of the band, and (b) farthest from the far end of the band? Robert Dawson lui répond.
	Units digit		2009-07-23
		Jyll pose la question : How do solve for the units digit? And that, what is the units digit of the first 1000 prime numbers? Robert Dawson lui répond.
	The diameter of a roll of plastic		2009-03-24
		truong pose la question : hi. i have trouble to calculate the diameter of the plastic roll. the sheet is 765 m long and 0.8 mm to wrap around the core 400 mm in dia. please help me with the formula to calculate the dia of plastic roll, thanks in advance Harley Weston lui répond.
	The units digit of 2^95		2009-03-18
		Sharvon pose la question : what is the units digit of 2^95 Robert Dawson lui répond.
	The 2 rightmost digits		2008-12-18
		Peter pose la question : 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? Robert Dawson and Victoria West lui répond.
	The last two digits		2006-07-22
		Sam pose la question : You have answered this question already but you only answered to one digit. What are the last TWO digits of: 3 to the power of 1994 7 to the power of 1994 3 to the power of 1994 + 7 to the power of 1994 7 to the power of 1994 - 3 to the power of 1994 Paul Betts and Penny Nom lui répond.
	n^2+n-1 has no divisors ending with 3 or 7		2005-09-08
		Arne pose la question : 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? Richard McIntosh lui répond.
	The last digit of a large exponent		2004-10-20
		Landon pose la question : 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? Penny Nom lui répond.
	The last digit of 2^28		2004-09-25
		A student pose la question : 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. Penny Nom lui répond.
	The units digit of 57 to the 28th power		2003-09-01
		Maria pose la question : 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? Penny Nom lui répond.

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