Επανάληψη στα μαθηματικά!

Πάμε να θυμηθούμε ό,τι κάναμε φέτος! δεν πιστεύω να τα ξεχάσατε! Εκτυπώστε, αν έχετε εκτυπωτή, ή αντιγράψτε τις ασκήσεις που ακολουθούν στο τετράδιο των μαθηματικών:       

  1. Γράφω με τη σειρά τους αριθμούς:

                                                                                                                                          

        20,.....,.....,.....,.....,.....,.....,.....,.....,.....,30

                                                                                                                                                    

    2. Συμπληρώνω τα κενά:

        20 ..... 22 , 22 ..... 24 , 24.....26                                                                                                                                                                                    

        28 ..... 30 , 21 ..... 23 , 23 ..... 25 , 25 ..... 27                                                                                                                                                                                                                                                                                                                                  

        ..... 22 ..... , ..... 24 ..... , ..... 26 ..... ,                                                     

                                         

        ..... 23 ..... , ..... 25 ..... , ..... 27 .....   

                                                                                                                                                                                                                                                                                                      

    3. Κάνω τις πράξεις:

                                      

       21 + 4 = ..... , 22 + 5 = ..... , 23 + 6 = ..... ,

   

       24 + 2 = ..... , 25 + 3 = ..... , 26 + 4 = ..... ,

                                                             

       27 + 3 = ..... , 28 + 1 = ..... , 29 + 1 = ..... ,

                                                                                              

       21 + 9 = ..... , 22 + 8 = ..... , 23 + 7 = ..... .  

    4. Κάνε τις πράξεις:

       8 + 6 + 5 + 4 = ..... , 3 + 7 + 9 + 6 = ..... ,

       4 + 3 + 6 + 9 = ..... , 2 + 8 + 8 + 8 =