Let's get this math done. We have 830 and we're going to multiply it by 30. This is the same as taking 830 and adding it to itself 30 times.
Step 1: 0 + 830 = 830
Step 2: 830 + 830 = 1660
Step 3: 1660 + 830 = 2490
Step 4: 2490 + 830 = 3320
Step 5: 3320 + 830 = 4150
Step 6: 4150 + 830 = 4980
Step 7: 4980 + 830 = 5810
Step 8: 5810 + 830 = 6640
Step 9: 6640 + 830 = 7470
Step 10: 7470 + 830 = 8300
Step 11: 8300 + 830 = 9130
Step 12: 9130 + 830 = 9960
Step 13: 9960 + 830 = 10790
Step 14: 10790 + 830 = 11620
Step 15: 11620 + 830 = 12450
Step 16: 12450 + 830 = 13280
Step 17: 13280 + 830 = 14110
Step 18: 14110 + 830 = 14940
Step 19: 14940 + 830 = 15770
Step 20: 15770 + 830 = 16600
Step 21: 16600 + 830 = 17430
Step 22: 17430 + 830 = 18260
Step 23: 18260 + 830 = 19090
Step 24: 19090 + 830 = 19920
Step 25: 19920 + 830 = 20750
Step 26: 20750 + 830 = 21580
Step 27: 21580 + 830 = 22410
Step 28: 22410 + 830 = 23240
Step 29: 23240 + 830 = 24070
Step 30: 24070 + 830 = 24900

So, 830*30 = 24900