Alright, let's solve this math problem step by step. First, we have the number 20. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 89. So, we're going to take the number 20 and add it to itself 89 times.
Step 1: 0 + 20 = 20
Step 2: 20 + 20 = 40
Step 3: 40 + 20 = 60
Step 4: 60 + 20 = 80
Step 5: 80 + 20 = 100
Step 6: 100 + 20 = 120
Step 7: 120 + 20 = 140
Step 8: 140 + 20 = 160
Step 9: 160 + 20 = 180
Step 10: 180 + 20 = 200
Step 11: 200 + 20 = 220
Step 12: 220 + 20 = 240
Step 13: 240 + 20 = 260
Step 14: 260 + 20 = 280
Step 15: 280 + 20 = 300
Step 16: 300 + 20 = 320
Step 17: 320 + 20 = 340
Step 18: 340 + 20 = 360
Step 19: 360 + 20 = 380
Step 20: 380 + 20 = 400
Step 21: 400 + 20 = 420
Step 22: 420 + 20 = 440
Step 23: 440 + 20 = 460
Step 24: 460 + 20 = 480
Step 25: 480 + 20 = 500
Step 26: 500 + 20 = 520
Step 27: 520 + 20 = 540
Step 28: 540 + 20 = 560
Step 29: 560 + 20 = 580
Step 30: 580 + 20 = 600
Step 31: 600 + 20 = 620
Step 32: 620 + 20 = 640
Step 33: 640 + 20 = 660
Step 34: 660 + 20 = 680
Step 35: 680 + 20 = 700
Step 36: 700 + 20 = 720
Step 37: 720 + 20 = 740
Step 38: 740 + 20 = 760
Step 39: 760 + 20 = 780
Step 40: 780 + 20 = 800
Step 41: 800 + 20 = 820
Step 42: 820 + 20 = 840
Step 43: 840 + 20 = 860
Step 44: 860 + 20 = 880
Step 45: 880 + 20 = 900
Step 46: 900 + 20 = 920
Step 47: 920 + 20 = 940
Step 48: 940 + 20 = 960
Step 49: 960 + 20 = 980
Step 50: 980 + 20 = 1000
Step 51: 1000 + 20 = 1020
Step 52: 1020 + 20 = 1040
Step 53: 1040 + 20 = 1060
Step 54: 1060 + 20 = 1080
Step 55: 1080 + 20 = 1100
Step 56: 1100 + 20 = 1120
Step 57: 1120 + 20 = 1140
Step 58: 1140 + 20 = 1160
Step 59: 1160 + 20 = 1180
Step 60: 1180 + 20 = 1200
Step 61: 1200 + 20 = 1220
Step 62: 1220 + 20 = 1240
Step 63: 1240 + 20 = 1260
Step 64: 1260 + 20 = 1280
Step 65: 1280 + 20 = 1300
Step 66: 1300 + 20 = 1320
Step 67: 1320 + 20 = 1340
Step 68: 1340 + 20 = 1360
Step 69: 1360 + 20 = 1380
Step 70: 1380 + 20 = 1400
Step 71: 1400 + 20 = 1420
Step 72: 1420 + 20 = 1440
Step 73: 1440 + 20 = 1460
Step 74: 1460 + 20 = 1480
Step 75: 1480 + 20 = 1500
Step 76: 1500 + 20 = 1520
Step 77: 1520 + 20 = 1540
Step 78: 1540 + 20 = 1560
Step 79: 1560 + 20 = 1580
Step 80: 1580 + 20 = 1600
Step 81: 1600 + 20 = 1620
Step 82: 1620 + 20 = 1640
Step 83: 1640 + 20 = 1660
Step 84: 1660 + 20 = 1680
Step 85: 1680 + 20 = 1700
Step 86: 1700 + 20 = 1720
Step 87: 1720 + 20 = 1740
Step 88: 1740 + 20 = 1760
Step 89: 1760 + 20 = 1780

So, 20*89 = 1780