Alright, let's solve this math problem step by step. First, we have the number 660. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 66. So, we're going to take the number 660 and add it to itself 66 times.
Step 1: 0 + 660 = 660
Step 2: 660 + 660 = 1320
Step 3: 1320 + 660 = 1980
Step 4: 1980 + 660 = 2640
Step 5: 2640 + 660 = 3300
Step 6: 3300 + 660 = 3960
Step 7: 3960 + 660 = 4620
Step 8: 4620 + 660 = 5280
Step 9: 5280 + 660 = 5940
Step 10: 5940 + 660 = 6600
Step 11: 6600 + 660 = 7260
Step 12: 7260 + 660 = 7920
Step 13: 7920 + 660 = 8580
Step 14: 8580 + 660 = 9240
Step 15: 9240 + 660 = 9900
Step 16: 9900 + 660 = 10560
Step 17: 10560 + 660 = 11220
Step 18: 11220 + 660 = 11880
Step 19: 11880 + 660 = 12540
Step 20: 12540 + 660 = 13200
Step 21: 13200 + 660 = 13860
Step 22: 13860 + 660 = 14520
Step 23: 14520 + 660 = 15180
Step 24: 15180 + 660 = 15840
Step 25: 15840 + 660 = 16500
Step 26: 16500 + 660 = 17160
Step 27: 17160 + 660 = 17820
Step 28: 17820 + 660 = 18480
Step 29: 18480 + 660 = 19140
Step 30: 19140 + 660 = 19800
Step 31: 19800 + 660 = 20460
Step 32: 20460 + 660 = 21120
Step 33: 21120 + 660 = 21780
Step 34: 21780 + 660 = 22440
Step 35: 22440 + 660 = 23100
Step 36: 23100 + 660 = 23760
Step 37: 23760 + 660 = 24420
Step 38: 24420 + 660 = 25080
Step 39: 25080 + 660 = 25740
Step 40: 25740 + 660 = 26400
Step 41: 26400 + 660 = 27060
Step 42: 27060 + 660 = 27720
Step 43: 27720 + 660 = 28380
Step 44: 28380 + 660 = 29040
Step 45: 29040 + 660 = 29700
Step 46: 29700 + 660 = 30360
Step 47: 30360 + 660 = 31020
Step 48: 31020 + 660 = 31680
Step 49: 31680 + 660 = 32340
Step 50: 32340 + 660 = 33000
Step 51: 33000 + 660 = 33660
Step 52: 33660 + 660 = 34320
Step 53: 34320 + 660 = 34980
Step 54: 34980 + 660 = 35640
Step 55: 35640 + 660 = 36300
Step 56: 36300 + 660 = 36960
Step 57: 36960 + 660 = 37620
Step 58: 37620 + 660 = 38280
Step 59: 38280 + 660 = 38940
Step 60: 38940 + 660 = 39600
Step 61: 39600 + 660 = 40260
Step 62: 40260 + 660 = 40920
Step 63: 40920 + 660 = 41580
Step 64: 41580 + 660 = 42240
Step 65: 42240 + 660 = 42900
Step 66: 42900 + 660 = 43560

So, 660*66 = 43560