- Arrange numbers - level 1
  - Arrange numbers - level 2
  - Arrange numbers - for professionals
  - Find numbers - level 1
  - Find numbers - level 2
  - Find numbers - for professionals

Place values
  - Recognize place values
  - Change place values -1-
  - Change place values -2-
  - Change place values -expert-
  - Convert texts into numbers
  - Convert texts into numbers -2-
Order
  - Predecessors and successors -1-
  - Predecessors and successors -2-
... increase & decrease
  - Practice -level 1-
  - Practice -level 2-
  - Practice -level 3-
  - Practice -expert-
Recognize number intervals
  - Practice -level 1-
  - Practice -level 2-
  - Practice -expert-
  - Practice -top expert-
Order numbers
  - Order numbers

Introduction
  - Creating Roman numerals
Roman to decimal
  - Converting -level 1-
  - Converting -level 2-
  - Converting -level 3-
  - Converting -professional
Decimal to Roman
  - Converting -level 1-
  - Converting -level 2-
  - Converting -professional-
Memory games
  - memory 1 to 10
  - memory 11 to 60
  - memory 4 to 50
  - memory 40 to 500
  - memory for experts
  - memory for champions
Order ...
  - Roman numerals -level 1-
  - Roman numerals -level 2-
  - Roman numerals -professional-

Introduction
  - Creating binary numbers
  - Recognize place values
Binary to decimal
  - With place value table -1-
  - With place value table -2-
  - Converting -level 1-
  - Converting -professional-
  - Converting -top expert-
Decimal to binary
  - With place value table -1-
  - With place value table -2-
  - With place value table -profi-
  - Converting -level 1-
  - Converting -profi-
  - Converting -top profi-
Memory games
  - memory -level 1-
  - memory -level 2-
  - memory for experts
Order
  - Successor of a binary number
  - Predecessor of a binary number
  - Combination
  - Deepen order -expert-

  - Rounding numbers
  - Rounding numbers for experts
  - Rounded up correctly?
  - Rounded down correctly
  - Rounded correctly?

Column diagram
  - Read values from diagrams -1-
  - Read values from diagrams -prof-
  - Recognize false diagrams -1-
  - Recognize false diagrams -prof-
  - Create diagrams - 1-
  - Create diagrams -prof-
  - Evaluate diagrams
Bar charts
  - Draw bar chart
  - Read bar chart
Analyze texts & diagrams
  - Visit to the realmath zoo
  - Class representative election -1-
  - Class representative election -prof-

Number sequences
  - Lay figures -level 1-
  - Lay figures -professional-
Number combinations
  - Combination lock -level 1-
  - Combination lock -level 2-
  - Combination lock -profi level 1-
  - Combination lock -profi level 2-
  - Combination lock -top profi-

Explanation
  - What is a power?
Exercises
  - Determine the base
  - Find the exponent
  - Specify the power
  - Larger or smaller
Square numbers -1-
  - from 1² to 10²
  - from 6² to 15²
  - from 11² to 20²
Square numbers -2-
  - from 1 to 100
  - from 36 to 225
  - from 121 to 400
Memory games
  - memory 1² to 10²
  - memory 6² to 16²
  - memory 11² to 20²
  - for experts only
Word problems
  - Exercise -level 1-
  - Exercise -level 2-
  - Exercise -expert level-

... with number arrows
  - Explanation of the model
  - Create addition -level 1-
  - Create addition -level 2-
  - Create addition -profi-
  - Read addition -level 1-
  - Read addition -level 2-
  - Read addition -profi-
Mental arithmetic
  - Add two numbers
  - One number is missing
  - Add to the place value
  - What is the value of x?
Calculate cleverly
  - Estimate sums
  - Use calculation advantages -1-
  - Use calculation advantages -2-
Column addition
  - Column addition -1-
  - Column addition -profi-
  - Column addition -2-
  - Column addition -top expert-
Number stars
  - Number star -level 1-
  - Number star -level 2-
  - Number star -level 3-
Arithmetic triangles
  - Arithmetic triangle - level 1
  - Arithmetic triangle - level 2
  - Arithmetic triangle - profi
Number pyramids
  - Addition pyramid -level 1-
  - Addition pyramid -level 2-
  - Addition pyramid -level 3-
  - Addition pyramid -level 4-
  - Addition pyramid -profi 1-
  - Addition pyramid -profi 2-
  - Addition pyramid -top profi-
Adding with tables
  - Table -level 1-
  - Attention! Table -profi 1-
  - Attention! Table -profi 2-
  - Attention! Table -top expert-
Competence oriented learning
  - Form sums
  - Build number wall
Apply arithmetic laws
  - Add three numbers -1-
  - Add three numbers -2-
  - Add four numbers -1-
  - Add four numbers -2-

... with number arrows
  - Explanation of the model
  - Create subtraction -level 1-
  - Create subtraction -level 2-
  - Create subtraction -profi-
  - Read subtraction -level 1-
  - Read subtraction -level 2-
  - Read subtraction -profi-
Mental arithmetic
  - Subtract two numbers
  - One number is missing
What is the value of x?
  - Difference searched
  - Minuend searched
  - Subtrahend searched
  - for professionals
  - Estimate differences
Column subtraction
  - Column subtraction -1-
  - Column subtraction -profi 1-
  - Column subtraction -profi 2-
  - Column subtraction -expert-
Number walls
  - Number wall -level 1-
  - Number wall -level 2-
  - Number wall -expert-
Word problems
  - Difference searched
  - Minuend searched
  - Subtrahend searched
  - for professionals
Advantageous arithmetic
  - Use calculation advantages -1-
  - Use calculation advantages -2-
Competence oriented learning
  - Form differences
  - Difference change -level 1-
  - Difference change -level 2-
  - Difference change -level 3-
  - Difference change -expert-

Mental arithmetic
  - ... with two numbers
Calculation chains
  - Complete the chain -1-
  - Complete the chain -2-
  - Complete the chain -expert-
Hidden numbers
  - Secret signs -1-
  - Secret signs -expert-
Arithmetic trees
  - Arithmetic tree -level 1-
  - Arithmetic tree -level 2-
  - Arithmetic tree -profi-
  - Arithmetic tree -top expert-
Magic squares
  - Adding square
Arithmetic house
  - Arithmetic house -level 1-
  - Arithmetic house -level 2-
  - Arithmetic house -level 3-
  - Arithmetic house -professional-
Tasks with brackets
  - Problem type -level 1-
  - Problem type -level 2-
  - Problem type -level 3-
  - Problem type -level 4-
  - Problem type -expert-
  - Problem type -top expert
Table problems
  - Table values -level 1-
  - Table values -profi-
  - Calculation rule 1
  - Calculation rule 2
  - Table values -champion-
Competence oriented learning
  - Form sums and differences
Text problems
  - Find the summands
  - Problems with text -1-
  - Problems with text -2-
  - Problems with text -3-

Mental arithmetic
  - ... with two numbers -1-
  - ... with two numbers -2-
Memory games
  - Times table from 2 to 9
  - Times table from 8 to 12
  - Times table from 2 to 12
Find missing numbers
  - Add what is missing?
  - What is the value of x?
  - With large numbers
  - Multiply three numbers
Arithmetic triangles
  - Triangle - level 1
  - Triangle - level 2
  - Triangle - expert
Number walls
  - Number wall - level 1-
  - Number wall - expert-
Tables
  - Partial product
  - Fill the table -level 1-
  - Fill the table -profi 1-
  - Fill the table -profi 2-
  - Fill the table -top expert-
Text problems
  - Variable task -Level 1-
  - Variable taske -expert-
Competence oriented learning
  - Form products
Column multiplication
  - Column multiplication -1-
  - Column multiplication -2-
  - Column multiplication -3-

Mental arithmetic
  - ... with two numbers -1-
  - ... with two numbers -2-
Find missing numbers
  - Add what is missing?
  - What is the value of x?
  - With large numbers
Tables
  - Find two numbers
Large numbers
  - Divide skillfully -1-
  - Divide skillfully -2-
Number walls
  - Number wall -level 1-
  - Number wall -level 2-
  - Number wall -expert-
Competence oriented learning
  - A remainder results?
  - Form quotients

Do you know the terms?
  - Know terms -level 1-
  - Know terms -level 2-
  - Know terms -level 3-
Mental arithmetic
  - ... for professional -
Arithmetic trees
  - Arithmetic tree -1-
  - Arithmetic trees -2-
Play darts
  - One dart is thrown
  - Add two darts
  - Add three darts
  - Championship -level 1-
  - Championship -level 2-
  - Championship -expert-
Basic arithmetic operations
  - order of operations -1-
  - order of operations -2-
  - order of operations -3-
  - order of operations -4-
  - order of operations -expert-
Convert texts into terms
  - Problems with text -1-
  - Problems with text -2-
  - Problems with text -expert-
Tasks formulated as text
  - Variable problem -profi-
  - Variable problem -top expert-
Competence oriented learning
  - Form products and quotients
  - Deepen arithmetic operations
  - Pinboard -level 1-
  - Pinboard -level 1-
  - Pinboard -expert-
Illustrate the laws of arithmetic
  - Distributive law -part 1-
  - Related exercise 1
  - Distributive law -part 2-
  - Related exercise 2
Apply arithmetic laws
  - Warm up
  - Apply distributive law -1-
  - Apply distributive law -2-
  - Apply distributive law -expert-