Alright, let's solve this math problem step by step. First, we have the number 540. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 78. So, we're going to take the number 540 and add it to itself 78 times.
Step 1: 0 + 540 = 540
Step 2: 540 + 540 = 1080
Step 3: 1080 + 540 = 1620
Step 4: 1620 + 540 = 2160
Step 5: 2160 + 540 = 2700
Step 6: 2700 + 540 = 3240
Step 7: 3240 + 540 = 3780
Step 8: 3780 + 540 = 4320
Step 9: 4320 + 540 = 4860
Step 10: 4860 + 540 = 5400
Step 11: 5400 + 540 = 5940
Step 12: 5940 + 540 = 6480
Step 13: 6480 + 540 = 7020
Step 14: 7020 + 540 = 7560
Step 15: 7560 + 540 = 8100
Step 16: 8100 + 540 = 8640
Step 17: 8640 + 540 = 9180
Step 18: 9180 + 540 = 9720
Step 19: 9720 + 540 = 10260
Step 20: 10260 + 540 = 10800
Step 21: 10800 + 540 = 11340
Step 22: 11340 + 540 = 11880
Step 23: 11880 + 540 = 12420
Step 24: 12420 + 540 = 12960
Step 25: 12960 + 540 = 13500
Step 26: 13500 + 540 = 14040
Step 27: 14040 + 540 = 14580
Step 28: 14580 + 540 = 15120
Step 29: 15120 + 540 = 15660
Step 30: 15660 + 540 = 16200
Step 31: 16200 + 540 = 16740
Step 32: 16740 + 540 = 17280
Step 33: 17280 + 540 = 17820
Step 34: 17820 + 540 = 18360
Step 35: 18360 + 540 = 18900
Step 36: 18900 + 540 = 19440
Step 37: 19440 + 540 = 19980
Step 38: 19980 + 540 = 20520
Step 39: 20520 + 540 = 21060
Step 40: 21060 + 540 = 21600
Step 41: 21600 + 540 = 22140
Step 42: 22140 + 540 = 22680
Step 43: 22680 + 540 = 23220
Step 44: 23220 + 540 = 23760
Step 45: 23760 + 540 = 24300
Step 46: 24300 + 540 = 24840
Step 47: 24840 + 540 = 25380
Step 48: 25380 + 540 = 25920
Step 49: 25920 + 540 = 26460
Step 50: 26460 + 540 = 27000
Step 51: 27000 + 540 = 27540
Step 52: 27540 + 540 = 28080
Step 53: 28080 + 540 = 28620
Step 54: 28620 + 540 = 29160
Step 55: 29160 + 540 = 29700
Step 56: 29700 + 540 = 30240
Step 57: 30240 + 540 = 30780
Step 58: 30780 + 540 = 31320
Step 59: 31320 + 540 = 31860
Step 60: 31860 + 540 = 32400
Step 61: 32400 + 540 = 32940
Step 62: 32940 + 540 = 33480
Step 63: 33480 + 540 = 34020
Step 64: 34020 + 540 = 34560
Step 65: 34560 + 540 = 35100
Step 66: 35100 + 540 = 35640
Step 67: 35640 + 540 = 36180
Step 68: 36180 + 540 = 36720
Step 69: 36720 + 540 = 37260
Step 70: 37260 + 540 = 37800
Step 71: 37800 + 540 = 38340
Step 72: 38340 + 540 = 38880
Step 73: 38880 + 540 = 39420
Step 74: 39420 + 540 = 39960
Step 75: 39960 + 540 = 40500
Step 76: 40500 + 540 = 41040
Step 77: 41040 + 540 = 41580
Step 78: 41580 + 540 = 42120

So, 540*78 = 42120