Let's get this math done. We have 948 and we're going to multiply it by 30. This is the same as taking 948 and adding it to itself 30 times.
Step 1: 0 + 948 = 948
Step 2: 948 + 948 = 1896
Step 3: 1896 + 948 = 2844
Step 4: 2844 + 948 = 3792
Step 5: 3792 + 948 = 4740
Step 6: 4740 + 948 = 5688
Step 7: 5688 + 948 = 6636
Step 8: 6636 + 948 = 7584
Step 9: 7584 + 948 = 8532
Step 10: 8532 + 948 = 9480
Step 11: 9480 + 948 = 10428
Step 12: 10428 + 948 = 11376
Step 13: 11376 + 948 = 12324
Step 14: 12324 + 948 = 13272
Step 15: 13272 + 948 = 14220
Step 16: 14220 + 948 = 15168
Step 17: 15168 + 948 = 16116
Step 18: 16116 + 948 = 17064
Step 19: 17064 + 948 = 18012
Step 20: 18012 + 948 = 18960
Step 21: 18960 + 948 = 19908
Step 22: 19908 + 948 = 20856
Step 23: 20856 + 948 = 21804
Step 24: 21804 + 948 = 22752
Step 25: 22752 + 948 = 23700
Step 26: 23700 + 948 = 24648
Step 27: 24648 + 948 = 25596
Step 28: 25596 + 948 = 26544
Step 29: 26544 + 948 = 27492
Step 30: 27492 + 948 = 28440

So, 948*30 = 28440