Arismetica is a tool for practicing the four operations  addition, subtraction, multiplication and division. See page "About Arismetica" for more information about how Arismetica can help you as a parent or teacher.
No, you do not need to create an account to use Arismetica. However, there are several benefits of creating a teacher account.
Get an activity code from your teacher to login and complete the math exercises prepared by your teacher. If you have logged in your teacher can follow you results while you complete the exercises.
Of course, you can practice math on Arismetica without logging in. Choose "Practice mathematics" in the menu above and then specify the operation you want to practice.
With a free teacher account you can create questions which mixed operations.
Of course. If you log in as a teacher, you can create an exercise to practise one or more multiplication tables which you want your students to practise.
With a free teacher account you can easily create your own mathexercises for your students. For example, you can choose to have mixed exercises including different operations, decide whether they will include crossing the tens boundary and weight the types of question.
Of course. If you are logged in as a teacher you can create exercises where you decide whether they include crossing the tens boundary.
If you are using an activity code from your teacher, your results are saved until your teacher deletes them. They are saved on Arismetica's server for your teacher to check your results.
If you haven't used an activity code, your results will only be saved on the mobile phone, tablet or computer used to answer the questions until you delete them.
If you are using an activity code from your teacher, your results are saved on Arismetica's server for your teacher to check. Results are saved until your teacher deletes them.
If you haven't used an activity code, the results are only saved on the device used to answer the questions and cannot be viewed on a different computer/tablet/mobile phone.
The level of difficulty is graded from 1 till 4, where level 1 is the easiest and level 4 the most difficult. The level of difficulty for the exercises depends on which numbers appear. Below is a simplified, as well as a detailed, overview of which numbers are used in the exercises.




Addition (a+b=c)  
Level  Integer a  Integer b  Integer c 
1  010  010  010 
2  120  120  220 
3  120  120  240 
4  1100  1100  11100 
Subtraction (a−b=c)  
Level  Integer a  Integer b  Integer c 
1  010  010  010 
2  115  115  014 
3  120  120  019 
4  120  120  (5)19 
Multiplication (a×b=c)  
Level  Integer a  Integer b  Integer c 
1  0, 1, 2, 5 or 10  0, 1, 2, 5 or 10  0100 
2  05 or 10  05 or 10  0100 
3  110  110  1100 
4  112  112  1144 
Division (a÷b=c)  
Level  Integer a  Integer b  Integer c 
1  050  15 or 10  15 or 10 
2  250  210  110 
3  1260  210  210 
4  12100  210  210 
Example, addition level 2
a+b=c where 1≤a≤20, 1≤b≤20 and 2≤c≤20
If e.g. a=18 then b must be either 1 or 2, because c≤20.
Example, subtraction level 2
a−b=c where 1≤a≤15, 1≤b≤15 and 0≤c≤14
If e.g. a=12 then 1≤b≤12, because c≥0.
If you think that Arismetica is not working as well as it should on your device, then please let us know. When you contact us you should provide a detailed description of when and how the problem occurs, as well as information regarding: