Esa Helttula
 - Same-Change SubtractionPaid- This app can be used to teach and study subtraction using the same-change rule. The app is easy to use and it has an intuitive interactive... iOS
- Decimal RoundingPaid- 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... iOS
 - Long DivisionPaid- The Long Division app has been featured by Apple in "New & Noteworthy", "Math - Numbers & Operations", and in "Math Apps for Middle School".... iOS
 - Partial Quotients DivisionPaid- This math app can be used to teach and study the partial quotients division method. The app is easy to use and it has an intuitive interactive... iOS
 - Visual Multiplication TablePaid- This app can be used to explore and learn the multiplication table in a visual way that increases intrinsic motivation. Wired.com: "I highly... iOS
 - Lattice MultiplicationPaid- This app can be used to teach and study the ancient lattice multiplication method. Solving lattice multiplication problems is also excellent times... iOS
 - Fraction MathPaid- The Fraction Math app can be used to teach and study fractions by solving addition, subtraction, division and multiplication problems with... iOS