Alright, let's solve this math problem step by step. First, we have the number 213. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 86. So, we're going to take the number 213 and add it to itself 86 times.
Step 1: 0 + 213 = 213
Step 2: 213 + 213 = 426
Step 3: 426 + 213 = 639
Step 4: 639 + 213 = 852
Step 5: 852 + 213 = 1065
Step 6: 1065 + 213 = 1278
Step 7: 1278 + 213 = 1491
Step 8: 1491 + 213 = 1704
Step 9: 1704 + 213 = 1917
Step 10: 1917 + 213 = 2130
Step 11: 2130 + 213 = 2343
Step 12: 2343 + 213 = 2556
Step 13: 2556 + 213 = 2769
Step 14: 2769 + 213 = 2982
Step 15: 2982 + 213 = 3195
Step 16: 3195 + 213 = 3408
Step 17: 3408 + 213 = 3621
Step 18: 3621 + 213 = 3834
Step 19: 3834 + 213 = 4047
Step 20: 4047 + 213 = 4260
Step 21: 4260 + 213 = 4473
Step 22: 4473 + 213 = 4686
Step 23: 4686 + 213 = 4899
Step 24: 4899 + 213 = 5112
Step 25: 5112 + 213 = 5325
Step 26: 5325 + 213 = 5538
Step 27: 5538 + 213 = 5751
Step 28: 5751 + 213 = 5964
Step 29: 5964 + 213 = 6177
Step 30: 6177 + 213 = 6390
Step 31: 6390 + 213 = 6603
Step 32: 6603 + 213 = 6816
Step 33: 6816 + 213 = 7029
Step 34: 7029 + 213 = 7242
Step 35: 7242 + 213 = 7455
Step 36: 7455 + 213 = 7668
Step 37: 7668 + 213 = 7881
Step 38: 7881 + 213 = 8094
Step 39: 8094 + 213 = 8307
Step 40: 8307 + 213 = 8520
Step 41: 8520 + 213 = 8733
Step 42: 8733 + 213 = 8946
Step 43: 8946 + 213 = 9159
Step 44: 9159 + 213 = 9372
Step 45: 9372 + 213 = 9585
Step 46: 9585 + 213 = 9798
Step 47: 9798 + 213 = 10011
Step 48: 10011 + 213 = 10224
Step 49: 10224 + 213 = 10437
Step 50: 10437 + 213 = 10650
Step 51: 10650 + 213 = 10863
Step 52: 10863 + 213 = 11076
Step 53: 11076 + 213 = 11289
Step 54: 11289 + 213 = 11502
Step 55: 11502 + 213 = 11715
Step 56: 11715 + 213 = 11928
Step 57: 11928 + 213 = 12141
Step 58: 12141 + 213 = 12354
Step 59: 12354 + 213 = 12567
Step 60: 12567 + 213 = 12780
Step 61: 12780 + 213 = 12993
Step 62: 12993 + 213 = 13206
Step 63: 13206 + 213 = 13419
Step 64: 13419 + 213 = 13632
Step 65: 13632 + 213 = 13845
Step 66: 13845 + 213 = 14058
Step 67: 14058 + 213 = 14271
Step 68: 14271 + 213 = 14484
Step 69: 14484 + 213 = 14697
Step 70: 14697 + 213 = 14910
Step 71: 14910 + 213 = 15123
Step 72: 15123 + 213 = 15336
Step 73: 15336 + 213 = 15549
Step 74: 15549 + 213 = 15762
Step 75: 15762 + 213 = 15975
Step 76: 15975 + 213 = 16188
Step 77: 16188 + 213 = 16401
Step 78: 16401 + 213 = 16614
Step 79: 16614 + 213 = 16827
Step 80: 16827 + 213 = 17040
Step 81: 17040 + 213 = 17253
Step 82: 17253 + 213 = 17466
Step 83: 17466 + 213 = 17679
Step 84: 17679 + 213 = 17892
Step 85: 17892 + 213 = 18105
Step 86: 18105 + 213 = 18318

So, 213*86 = 18318