Esa Helttula

The World Factbook Visual Edition has information on the people, society, government, economy, geography, communications, transportation, military, an …

This math app is about the concept of order of operations. The user can evaluate random and custom expressions with exponentiation, division, multipli …

This math app is about visually exploring how percentages and decimals are just special kinds of fractions with their own notation. There are no tasks …

This math app can be used to teach and study the rounding of whole numbers. You can set your own problems or solve random problems. The numbers to be …

This math app can be used to teach and study the rounding of decimals. You can set your own problems or solve random problems. The decimal numbers can …

This math app can be used to teach and study the Russian multiplication method. The user can solve random or custom multiplication problems. The numbe …

This math app can be used to teach and study the equal addition subtraction method. The user can solve random or custom subtraction problems with smal …

With the Polynomial Addition and Subtraction app you can practice adding and subtracting polynomials with a step-by-step method. And you can get addit …

With the Polynomial Multiplication app you can practice multiplying polynomials with a step-by-step method. And you can get additional help at each st …

Wired.com: "It’s fantastic for helping kids (and grown-ups) practice polynomial manipulation and division. I can’t recommend Esa’s math apps enough."W …