Alright, let's solve this math problem step by step. First, we have the number 780. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 70. So, we're going to take the number 780 and add it to itself 70 times.
Step 1: 0 + 780 = 780
Step 2: 780 + 780 = 1560
Step 3: 1560 + 780 = 2340
Step 4: 2340 + 780 = 3120
Step 5: 3120 + 780 = 3900
Step 6: 3900 + 780 = 4680
Step 7: 4680 + 780 = 5460
Step 8: 5460 + 780 = 6240
Step 9: 6240 + 780 = 7020
Step 10: 7020 + 780 = 7800
Step 11: 7800 + 780 = 8580
Step 12: 8580 + 780 = 9360
Step 13: 9360 + 780 = 10140
Step 14: 10140 + 780 = 10920
Step 15: 10920 + 780 = 11700
Step 16: 11700 + 780 = 12480
Step 17: 12480 + 780 = 13260
Step 18: 13260 + 780 = 14040
Step 19: 14040 + 780 = 14820
Step 20: 14820 + 780 = 15600
Step 21: 15600 + 780 = 16380
Step 22: 16380 + 780 = 17160
Step 23: 17160 + 780 = 17940
Step 24: 17940 + 780 = 18720
Step 25: 18720 + 780 = 19500
Step 26: 19500 + 780 = 20280
Step 27: 20280 + 780 = 21060
Step 28: 21060 + 780 = 21840
Step 29: 21840 + 780 = 22620
Step 30: 22620 + 780 = 23400
Step 31: 23400 + 780 = 24180
Step 32: 24180 + 780 = 24960
Step 33: 24960 + 780 = 25740
Step 34: 25740 + 780 = 26520
Step 35: 26520 + 780 = 27300
Step 36: 27300 + 780 = 28080
Step 37: 28080 + 780 = 28860
Step 38: 28860 + 780 = 29640
Step 39: 29640 + 780 = 30420
Step 40: 30420 + 780 = 31200
Step 41: 31200 + 780 = 31980
Step 42: 31980 + 780 = 32760
Step 43: 32760 + 780 = 33540
Step 44: 33540 + 780 = 34320
Step 45: 34320 + 780 = 35100
Step 46: 35100 + 780 = 35880
Step 47: 35880 + 780 = 36660
Step 48: 36660 + 780 = 37440
Step 49: 37440 + 780 = 38220
Step 50: 38220 + 780 = 39000
Step 51: 39000 + 780 = 39780
Step 52: 39780 + 780 = 40560
Step 53: 40560 + 780 = 41340
Step 54: 41340 + 780 = 42120
Step 55: 42120 + 780 = 42900
Step 56: 42900 + 780 = 43680
Step 57: 43680 + 780 = 44460
Step 58: 44460 + 780 = 45240
Step 59: 45240 + 780 = 46020
Step 60: 46020 + 780 = 46800
Step 61: 46800 + 780 = 47580
Step 62: 47580 + 780 = 48360
Step 63: 48360 + 780 = 49140
Step 64: 49140 + 780 = 49920
Step 65: 49920 + 780 = 50700
Step 66: 50700 + 780 = 51480
Step 67: 51480 + 780 = 52260
Step 68: 52260 + 780 = 53040
Step 69: 53040 + 780 = 53820
Step 70: 53820 + 780 = 54600

So, 780*70 = 54600