Calculam tinand cont de regula operatiilor: mai intai efectuam inmultiri, impartiri, adunari si scaderi, in ordinea in care apar. La exercitiile cu paranteze mai intai facem calculele din parantezele rotunde, apoi patrate, si la final acoladele.
10 x 4 : 5 x 3 + 32 - 32 : 8 = 40 : 5 x 3 + 32 - 4 = 8 x 3 + 32 - 4 = 24 + 32 - 4 = 56 - 4 = 52
600 - 56 + 56 : 8 × 9 - 50 : 5 : 10 × 3 = 544 + 7 x 9 - 10 : 10 x 3 = 544 + 63 - 1 x 3 = 607 -3 = 604
100 - (42 + 42 : 6 + 5 × 3) = 100 - (42 + 7 + 15) = 100 - (49 + 15) = 100 - 64 = 36
(70 - 8 × 7) : 2 + (21 + 21 : 3) = (70 - 56) : 2 + (21 + 7) = 14 : 2 + 28 = 7 + 28 = 35
340 - (100 - 100 : 10 × 7 + 9 × 7) = 340 - (100 - 10 x 7 + 63) = 340 - (100 - 70 + 63) = 340 - (30 + 63) = 340 - 93 = 247
(80 - 6 × 9) × (163 - 7 × 9) = (80 - 54) x (163 - 63) = 26 x 100 = 2 600
(100 - 28) : (45 - 36) + (4 × 8 + 9 × 5) : 7 = 72 : 9 + (32 + 45) :7 = 8 + 77 : 7 = 8 + 11 = 19
