Sure thing! We've got 13 and we're gonna multiply it by 28. That's the same as adding 13 to itself 28 times.
Step 1: 0 + 13 = 13
Step 2: 13 + 13 = 26
Step 3: 26 + 13 = 39
Step 4: 39 + 13 = 52
Step 5: 52 + 13 = 65
Step 6: 65 + 13 = 78
Step 7: 78 + 13 = 91
Step 8: 91 + 13 = 104
Step 9: 104 + 13 = 117
Step 10: 117 + 13 = 130
Step 11: 130 + 13 = 143
Step 12: 143 + 13 = 156
Step 13: 156 + 13 = 169
Step 14: 169 + 13 = 182
Step 15: 182 + 13 = 195
Step 16: 195 + 13 = 208
Step 17: 208 + 13 = 221
Step 18: 221 + 13 = 234
Step 19: 234 + 13 = 247
Step 20: 247 + 13 = 260
Step 21: 260 + 13 = 273
Step 22: 273 + 13 = 286
Step 23: 286 + 13 = 299
Step 24: 299 + 13 = 312
Step 25: 312 + 13 = 325
Step 26: 325 + 13 = 338
Step 27: 338 + 13 = 351
Step 28: 351 + 13 = 364

So, 13*28 = 364