84 · 30 = 2520; 67500 : 500 = 135; 770 · 4 = 3080; 42200 : 20 = 2110; 6800 · 60 = 408000; 359 − 277 = 82; 25800 : 860 = 30; 709 − 256 = 453; 66000 : 330 = 200; 536 − 87 = 449; 878 + 110 = 988; 670 · 30 = 20100; 281 + 101 = 382; 8800 · 40 = 352000; 48 + 709 = 757; 5850 : 39 = 150; 4360 : 2 = 2180; 66000 : 200 = 330; 27000 : 90 = 300; 75900 : 230 = 330; 218 − 2 = 216; 217 + 117 = 334; 645 − 32 = 613; 418 + 533 = 951; 752 − 21 = 731.