OK, let's work through this together. We're starting with 53 and we're going to multiply it by 27, which means we add 53 to itself 27 times.
Step 1: 0 + 53 = 53
Step 2: 53 + 53 = 106
Step 3: 106 + 53 = 159
Step 4: 159 + 53 = 212
Step 5: 212 + 53 = 265
Step 6: 265 + 53 = 318
Step 7: 318 + 53 = 371
Step 8: 371 + 53 = 424
Step 9: 424 + 53 = 477
Step 10: 477 + 53 = 530
Step 11: 530 + 53 = 583
Step 12: 583 + 53 = 636
Step 13: 636 + 53 = 689
Step 14: 689 + 53 = 742
Step 15: 742 + 53 = 795
Step 16: 795 + 53 = 848
Step 17: 848 + 53 = 901
Step 18: 901 + 53 = 954
Step 19: 954 + 53 = 1007
Step 20: 1007 + 53 = 1060
Step 21: 1060 + 53 = 1113
Step 22: 1113 + 53 = 1166
Step 23: 1166 + 53 = 1219
Step 24: 1219 + 53 = 1272
Step 25: 1272 + 53 = 1325
Step 26: 1325 + 53 = 1378
Step 27: 1378 + 53 = 1431

So, 53*27 = 1431