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the math doctors continuing the mentoring tradition of ask dr math skip to content main menu home ask a question blog faq about the math doctors contact search search for have a question ask it here we are a group of experienced volunteers whose main goal is to help you by answering your questions about math to ask anything just click here recent blog posts using a z table rounding and interpolating what is a z score and why what does the normal curve really look like names of small numbers one to twenty names of large numbers vigintillion and beyond blog archive september 2026 1 august 2026 2 july 2026 2 june 2026 2 may 2026 1 april 2026 2 march 2026 2 february 2026 2 january 2026 2 december 2025 2 november 2025 2 october 2025 3 september 2025 2 august 2025 2 july 2025 4 june 2025 4 may 2025 5 april 2025 4 march 2025 4 february 2025 4 january 2025 5 december 2024 4 november 2024 4 october 2024 3 september 2024 3 august 2024 5 july 2024 4 june 2024 4 may 2024 2 april 2024 4 march 2024 5 february 2024 4 january 2024 4 december 2023 5 november 2023 4 october 2023 4 september 2023 5 august 2023 4 july 2023 4 june 2023 5 may 2023 4 april 2023 4 march 2023 5 february 2023 4 january 2023 4 december 2022 5 november 2022 4 october 2022 4 september 2022 5 august 2022 4 july 2022 5 june 2022 4 may 2022 4 april 2022 5 march 2022 4 february 2022 4 january 2022 4 december 2021 5 november 2021 4 october 2021 5 september 2021 4 august 2021 4 july 2021 5 june 2021 4 may 2021 9 april 2021 9 march 2021 9 february 2021 7 january 2021 7 december 2020 7 november 2020 8 october 2020 9 september 2020 8 august 2020 9 july 2020 8 june 2020 9 may 2020 8 april 2020 9 march 2020 9 february 2020 8 january 2020 9 december 2019 9 november 2019 8 october 2019 9 september 2019 9 august 2019 9 july 2019 9 june 2019 8 may 2019 9 april 2019 9 march 2019 8 february 2019 8 january 2019 9 december 2018 13 november 2018 13 october 2018 14 september 2018 12 august 2018 4 july 2018 5 june 2018 13 may 2018 13 april 2018 13 march 2018 10 february 2018 12 january 2018 14 categories algebra 221 aqotw 67 arithmetic 112 ask dr math 6 calculus 96 geometry 103 higher math 21 logic 33 nqotw 171 probability 52 puzzles 30 statistics 37 study skills 8 trigonometry 66 tags algorithms alternatives ambiguity assumptions averages challenges checking combinatorics complex numbers counting curiosity decimals definitions derivatives estimation factors fibonacci formulas fractions functions graphing history inconsistency induction integration intuition limits logic methods mistakes models notation pedagogy pemdas polynomials primes proof proofs real life strategies textbook errors vectors why word problems words recent comments dave peterson on order of operations common misunderstandings sally migliore on order of operations common misunderstandings implicit differentiation what to do when it s wrong the math doctors on implicit differentiation explanation examples and a surprise dave peterson on implied multiplication 1 not as bad as you think stanislaw goldstein on implied multiplication 1 not as bad as you think about this site the math doctors is run entirely by volunteers who love sharing their knowledge of math with people of all ages we have over 20 years of experience as a group and have earned the respect of educators for some of our past history see about ask dr math if you would like to volunteer or to contribute in other ways please contact us math questions answered thoughtfully for over twenty five years the math doctors have enjoyed answering questions at ask dr math the question and answer service of the math forum we have talked about all aspects of math from homework questions to work related practical math to how or why questions arising from curiosity or confusion unfortunately in late 2017 the site stopped taking questions but we don t want to stop answering them a group of us joined together to create this new site as a way to continue our mission of mentoring anyone who writes to us and to move it up a level note in january 2021 the ask dr math site to which we frequently refer was moved from mathforum org and drmath org to https www nctm org tmf dr math subsequently the nctm has made it accessible only to their members contrary to their 2017 announcement that the archives of dr math will remain freely available on this website for the foreseeable future update as of late june 2021 the ask dr math archives can be found at https www nctm org archives dr math which requires a free nctm account if you are not a teacher just pretend you are when you create the account links on our site have now been updated to point to the new locations though the original addresses are often shown if we missed any you can manually change an address like http mathforum org library drmath view 59206 html to https www nctm org archives library drmath view 59206 html in order to access it that is replace http mathforum org in the address bar with https www nctm org archives unfortunately it appears that there is currently no way to search the archives and a few pages seem to have disappeared unlike other free math help sites we are not a public discussion board where anyone might answer your question sometimes rudely or incorrectly but a group of dedicated volunteers who care about doing it right answering your questions privately and carefully we then make the most generally useful discussions available in an edited form for the benefit of the public with private information removed of course we want to provide a safe comfortable environment for anyone to ask questions from preschool through grad school from basic arithmetic through college math and from students to parents to teachers to workers we strive to be encouraging helpful polite and correct teachers and students alike have trusted us for decades and we are committed to continuing that tradition our members have years of experience starting with an internship in which we discussed our work with an experienced mentor dr ian for many of us who passed on to us the culture of the math doctors how to give just the right amount of help rather than solving a problem for you and how to interact patiently no matter what kind of question you have or how awkwardly you ask it the ask dr math archive still provides access to the thousands of good discussions that we archived under the math forum out of hundreds of thousands of questions we answered there we encourage you to look there first if you have a question because there is a good chance we have already answered it but often reading is not enough you need interaction with someone who understands you we re here to give you whatever individual help you need the blog plays the role of archive for current questions to ask a new question go to the ask a question page the doctors office no registration is needed just give us your name it doesn t have to be your full name and email which will never be published but is needed to send a reply and a little information about you so we can have an idea of your level of knowledge and ask away make sure the address you give us is valid and that our reply will not be treated as spam since our goal is not just to give you answers but to help you learn to solve problems for yourself we need to see your work and hear what is giving you trouble just sending us a problem with no work will get you no more than a hint of how to start if your question is a general one rather than a specific exercise all the better but even then a specific example may help explain what you are asking you can upload a picture or other document to help show the details of the problem or your work but don t rely on a picture to ask the entire question when you submit the question we will send you an acknowledgment email telling you that we received it when we reply you will get another email follow the link it provides read our answer and write back if necessary the blog is where we discuss publicly what we have learned from past or recent conversations adding value to the old archive and sharing insights from new questions each week we plan to post an exploration of a topic that has been dealt with in several ways over the years there may also be a look at a favorite old answer that we run across in the course of our work archive question of the week or an answer from recent months on this new site to show what we are currently doing new question of the week these posts will introduce you to a wide variety of questions from the past and present inviting you to explore the archive with us and perhaps provoking further questions from you of course feel free to respond to anything we write here using the comment section but if you have a question for further discussion it will be better to submit it as a new question referencing the blog as needed have a question of your own ask a question search blog search for meta log in entries feed comments feed wordpress org copyright 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