THEORY    
    
        T    
    
        1.
    
    
        Natural numbers and integers    
    
            
            
     
                                                                                    
    
        PRACTICE    
    
        P    
    
        2.
    
    
        Recognising basis properties of integers    
    
        3    
            
     
                                                                                    
    
        THEORY    
    
        T    
    
        3.
    
    
        Arithmetic calculations with integers    
    
            
            
     
                                                                                    
    
        PRACTICE    
    
        P    
    
        4.
    
    
        Doing basic calculations with natural numbers    
    
        4    
            
     
                                                                                    
    
        PRACTICE    
    
        P    
    
        8.
    
    
        Carrying out a long division    
    
        3    
            
     
                                                                                    
    
        THEORY    
    
        T    
    
        9.
    
    
        Divisors, prime numbers, and prime factorisations    
    
            
            
     
                                                                                    
    
        PRACTICE    
    
        P    
    
        10.
    
    
        Decomposing a number into prime factors    
    
        4    
            
     
                                                                                    
    
        PRACTICE    
    
        P    
    
        12.
    
    
        Computing the gcd and lcm    
    
        5