9. Täida lüngad.
    Sõnasta korrutamise vahetuvusseadus: .........................................................
............................................................................. Sümbolites: ......................
Lõpeta:  a(bc) = ................ See on korrutamise .................................... seadus.
Summa korrutamise seadus sümbolites:................................................
Jätka:  6(15 + 14) = ..................................  Kasuta vahe korrutamise seadust:

5 · 79 = 5 · (.............) = 5 ·...... - 5 · ........ = .........
Jagatava saan, .................................................................................................
Jagaja saan, kui ...............................................................................................

10. Arvuta peast.

    4 · 23 · 15                            6 · 65                                    7(30 + 14)
    8(125 - 45)                           406 · 7                                  6 · 71 · 50
    50 · 8 · 125                           8 · 99                                    55 · 6
    8 · 505 · 1                             0 · 3 456                                3 · 3 · 3 · 5

11. Arvuta peast.

    525 : 5                            34 000 : 170                            57 800 : 100
    808 : 8                            510 : 3                                    45 000 000 : 100 000
    22 000 : 200                    567 : 0                                    0 : 34 508

12. Kuidas sa leiad jagatava, kui on teada jagaja, jagatis ja jääk?
      .............................................................................................................................
 
    74 : 8 = 9 jääk 2                74 = 8 · 9 + 2
    58 : 4 = ............                58 = ................
  141 : 2 = ............               141 = .................
  402 : 4 = ............               402 = .................
  806 : 8 = ............               806 = .................
 

13. Arvuta peast.

                8                    15 000                13 000                10 000
      · 12 000                   + 3 000                     ·  6                - 2 000
        : 8 000                          :  2               +6 000                      ·  7
        · 6 000                         · 11              :  3 000                - 5 000
       + 3 000                   -  8 000                     - 3                :  3 000
            :    5                          :  7                ·  400                       + 6
        ...........                    ..........                .........                ...........
 

14. Jagatav ja jagaja mõlemad suurenevad 10 korda. Kas jagatis muutub?
     Vastus: .................................