Ordinea operațiilor

Front

20 - 4 x 4

Back

4

Front

72 : 9 + 2

Back

10

Front

15 - 15 : 5

Back

12

Front

100 : 10 - 1

Back

9

Front

100 - 100 : 10

Back

90

Front

75 + 25 - 50

Back

50

Front

25 : 5 x 8

Back

40

Front

40 : 2 : 10 + 5 x 8 : 10

Back

6