27+30
=57
9x12
=108
18:3
=6
100-54
=46
275+57
=327
7x7
=49
49:7
=7
999-811
=188
526+74
=600
100x1,5
150
100:12
=8,3
26,6+57,2
=83,8
1000x77
=77000
22222:2
=11111
567+879
=1446
171x4
=684
=22222