Saltire Software, Inc. Apps

This collection contains applets that willhelp teachers implement Common Core Statistics Standard S-ID 6a, b,c for High School Mathematics.

Mathematics and harmless fun are blended inthis virtual trammel app.Archimedes' trammel is a device for drawing an ellipse. Alsoknown as the do-nothing machine or the nothing grinder, you can buyone made from wood at your local craft fair for a few bucks.This app is a virtual trammel … you can grind away at nothingelectronically. You can change the length of the handle andplacement of the sliders and see how the ellipse changes. You canalso relate the trammel drawn ellipse to one drawn with two pinsand a piece of string (mathematically speaking this relates themajor and minor axes to the foci)You can also investigate the interesting curve you get if youturn the trammel upside down and move the base while keeping thehandle stationary.Finally we provide a super-trammel: a trammel with 3 sliders,which moves, even though at first glance, you’d think it shouldn't.Take a look and see if you can work out why it is able to move.

This collection contains apps that will helpteachers implement Common Core Function Standard F-TF 2, 3, 5 forHigh School Mathematics. Apps with an * indicate that they addressthe modeling standard.

A collection of 24 whimsical clocks illustratevarious mathematical and engineering concepts, and are just plainfun to watch.From a digital clock based on an abacus, to an analog clockwhose hands wind around a circle (tracing an involute spiral),these clocks will entertain and intrigue you.Exercise your inner Salvador Dali by distorting your own clocks.Watch other clocks change shape as the minutes pass.Challenge your inner mathematician with a clock whose secondstick away Euclid’s proof of the Pythagorean Theorem.Wake your inner engineer with a clock whose hands are driven byfour-bar linkages.

This collection contains apps that will helpteachers implement Common Core Standard 8.G.6 for 8th grademathematics.

This collection contains apps that will helpteachers implement Common Core Standard 6.G.1 for 6th grademathematics.

This collection contains apps that willhelpteachers implement Common Core Functions Standard F-BF 3 forHighSchool Mathematics.

This collection contains apps that willhelpteachers implement Common Core Geometry Standard G-GPE 1, 3forHigh School Mathematics.

This collection contains apps that willhelpteachers implement Common Core Standard 7.EE.1 for 7thgrademathematics.