Tutoring college math, complex numbers will likely arise. The tutor mentions using Excel. Square roots of negative numbers (aka, complex numbers or imaginary numbers) may not be encountered by many high school students. However, in college math they are used, …
Tutoring math, calculators can always be interesting. The tutor shares a capability of the Nexus 4 on-board calculator. If the Nexus 4 on-board calculator has broad complex number capabilities, I don’t know about them. I tried √(-4) and got Not …
Calculator Usage: Euler’s identity with the Nexus 4’s on-board scientific Read more »
Tutoring math, you notice the peculiarities of scientific calculators. The tutor brings up one about the Casio fx-991ES PLUS C. If you enter the operation 14รท9 into the Casio fx-991ES PLUS C, you’ll just as likely see 14/9 on the …
Math: How to convert between fraction and decimal on the Casio fx-991ES PLUS C Read more »
Tutoring math, all kinds of relationships might call out to you. The tutor brings up the water loss from grape to raisin. According to one source, fresh grapes contain 1g fibre per 138g. According to another source, raisins contain 1g …
Tutoring math, you come to appreciate calculators. The tutor points out an interesting feature on the Casio fx-991ES PLUS C. Typically, the log key on a calculator means “base 10 log”, aka “common log.” What about base 7 log, for …
Calculator usage, math: logs in variable bases with the Casio fx-991ES PLUS C Read more »
Tutoring statistics, mean is used more than median. The tutor points out a reason why. In my post from November 30, 2014, I write about why the median might be preferred to the mean in some cases. For instance, the …
Estimation of expected value: why sample mean is usually preferred over median Read more »
Tutoring math, calculator features are always topical. The tutor mentions the ENG function on the Casio fx-991ES PLUS C. Back in my Halloween, 2015 post, I explain the general idea of the ENG function – that engineers and technicians often …
Calculator usage: the ENG feature on the Casio fx-991ES PLUS C Read more »
Tutoring financial math, you might often use the HP-10B. The tutor shows how easily it can apply a discount then add tax to get the final price. Example: Imagine a handbag is regular price $85 but is discounted by 20%. …
Calculator usage: finding final price after discount and tax with the HP-10B Read more »
Tutoring financial math, you might fall in love with a calculator. The tutor tells about markup on the HP-10B. Example: Imagine you buy a product for $35, then want to apply a 25% markup. Find the tag price using the …
Tutoring financial math, you’ll likely encounter the capable HP-10B. The tutor tells how to use its user-accessible memory. The HP-10B seems to have 11 dedicated places to store your own numbers. The locations are at 0 to 9, plus there …