Difference between revisions of "2008 iTest Problems/Problem 15"
Coolmath34 (talk | contribs) (Created page with "==Problem== How many four-digit multiples of <math>8</math> are greater than <math>2008</math>? ==Solution== We can make a list of four-digit multiples of <math>8</math> that...") |
Rockmanex3 (talk | contribs) (Corrected math error) |
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<cmath>252, 253, 254, ..., 1248, 1249</cmath> | <cmath>252, 253, 254, ..., 1248, 1249</cmath> | ||
Now subtract <math>251</math> from every member of the list. | Now subtract <math>251</math> from every member of the list. | ||
− | <cmath>1, 2, 3, ..., 998, | + | <cmath>1, 2, 3, ..., 998, 998</cmath> |
− | There are <math> | + | There are <math>998</math> numbers in this list, so there are <math>\boxed{998}</math> four-digit multiples of <math>8</math> that are greater than <math>2008.</math> |
*Feel free to edit answer if this is not correct, but do not edit the process. | *Feel free to edit answer if this is not correct, but do not edit the process. | ||
+ | |||
+ | ==See Also== | ||
+ | {{2008 iTest box|num-b=14|num-a=16}} | ||
+ | |||
+ | [[Category:Introductory Number Theory Problems]] |
Latest revision as of 12:25, 22 June 2018
Problem
How many four-digit multiples of are greater than ?
Solution
We can make a list of four-digit multiples of that are greater than The smallest multiple of that is larger than is so we can start with The largest four-digit multiple of 8 is Divide everything in the list by Now subtract from every member of the list. There are numbers in this list, so there are four-digit multiples of that are greater than
- Feel free to edit answer if this is not correct, but do not edit the process.
See Also
2008 iTest (Problems) | ||
Preceded by: Problem 14 |
Followed by: Problem 16 | |
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