Aritm by MOB - Aritm trains you in simple mental calculation. This program teaches its users the addition, subtraction, multiplication, and division tables. It employs a very effective method, which makes the process short with these useful tables. If you know these tables it is much easier to follow the mathematics education. Further more, you can use them in everyday situations, especially if you also know rough estimate calculation. These tables, neither more nor less, is everything you need to know by heart, because there are manual methods for calculating with more complicated numbers. It is always good to do an Aritm workout before you are going to a math test. You can mix the problems anyway you like, e.g. you can choose addition and multiplication at the same time.
The sum of two single digit terms.
The sum of one double digit and one single digit term.
The difference of two small terms.
The difference of one larger term and one smaller.
The problem is written M from N, instead of N-M.
The product of two single digit factors.
The quotient between two numbers. The dividend (numerator) is usually larger than the divisor (denominator).
When you have checked which problems you want, you select Start, and write the answer using digits and select Enter. If your answer is incorrect, you will get that problem again, later. If you want to end prematurely, select Stop. You should make about 10 problems per minute or more. In the end you will know this anyway. You may also pause and the clock is stopped during the pause.
Complex Numbers Calculator Using the complex numbers calculator the answers to algebra problems covering this topic is only as far as your mobile phone
HexNumber This is a number converter. You can enter a decimal, hexdecimal, binary or octal number and see what it is in the other formats. The full version has a very much better interface plus you can convert to and from any base, it's available only for 0.5$