![]() If the name “arithmetic series” means nothing, then what have you been learning? There might be another way to approach the problem. ![]() Please show me what you can do, even if that is only to list possibly relevant definitions or formulas. Have you learned any formulas or done example problems? That could be a starting point for thinking about your problem. What are your thoughts about the problem? When I say “arithmetic series”, that’s a big hint assuming you have learned about them - and I imagine the problem comes from a unit on arithmetic series. Rather than provide you with a formula (reinforcing the wrong idea that math is all about formulas), I want to know what you have learned recently, so that I can help you apply what you already know. ![]() Hi, Daniel, thanks for writing to the Math Doctors. What formulas do you know?ĭoctor Rick answered, giving a hint while asking for information: So we need to start by finding out about those things. Sometimes we get real life problems that can look a lot like word problems but Daniel gave his age as high school, and the situation is a little too precise for real life! So we can infer the general context, but not Daniel’s level of knowledge, or what he has been learning that he is expected to use. Please include formula, thank you in advance. ![]() Assuming no stock is sold, stolen or destroyed, how many months will it take to reach 200,000 and how many units of stock would have been purchased in that final month? Each month the stock purchased increases by 10 units (so next month will be 3270 and the month after, 3280). I currently have 3260 units of inventory/stock. We’ll see how formulas can be used in solving problems, but are not all we need.Īt the very end of March, Daniel wrote to us with this question: Here is a recent question about arithmetic sequences and series (specifically, reversing the process to find the number of terms given the sum), that nicely illustrates a common type of interaction with a student: gathering information about both problem and student, then guiding them to use what they know, or giving new information as needed. ![]()
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