Let's roll up our sleeves and solve this. We have 435 and we're going to multiply it by 35, essentially adding 435 to itself 35 times.
Step 1: 0 + 435 = 435
Step 2: 435 + 435 = 870
Step 3: 870 + 435 = 1305
Step 4: 1305 + 435 = 1740
Step 5: 1740 + 435 = 2175
Step 6: 2175 + 435 = 2610
Step 7: 2610 + 435 = 3045
Step 8: 3045 + 435 = 3480
Step 9: 3480 + 435 = 3915
Step 10: 3915 + 435 = 4350
Step 11: 4350 + 435 = 4785
Step 12: 4785 + 435 = 5220
Step 13: 5220 + 435 = 5655
Step 14: 5655 + 435 = 6090
Step 15: 6090 + 435 = 6525
Step 16: 6525 + 435 = 6960
Step 17: 6960 + 435 = 7395
Step 18: 7395 + 435 = 7830
Step 19: 7830 + 435 = 8265
Step 20: 8265 + 435 = 8700
Step 21: 8700 + 435 = 9135
Step 22: 9135 + 435 = 9570
Step 23: 9570 + 435 = 10005
Step 24: 10005 + 435 = 10440
Step 25: 10440 + 435 = 10875
Step 26: 10875 + 435 = 11310
Step 27: 11310 + 435 = 11745
Step 28: 11745 + 435 = 12180
Step 29: 12180 + 435 = 12615
Step 30: 12615 + 435 = 13050
Step 31: 13050 + 435 = 13485
Step 32: 13485 + 435 = 13920
Step 33: 13920 + 435 = 14355
Step 34: 14355 + 435 = 14790
Step 35: 14790 + 435 = 15225

So, 435*35 = 15225