Let's roll up our sleeves and solve this. We have 235 and we're going to multiply it by 18, essentially adding 235 to itself 18 times.
Step 1: 0 + 235 = 235
Step 2: 235 + 235 = 470
Step 3: 470 + 235 = 705
Step 4: 705 + 235 = 940
Step 5: 940 + 235 = 1175
Step 6: 1175 + 235 = 1410
Step 7: 1410 + 235 = 1645
Step 8: 1645 + 235 = 1880
Step 9: 1880 + 235 = 2115
Step 10: 2115 + 235 = 2350
Step 11: 2350 + 235 = 2585
Step 12: 2585 + 235 = 2820
Step 13: 2820 + 235 = 3055
Step 14: 3055 + 235 = 3290
Step 15: 3290 + 235 = 3525
Step 16: 3525 + 235 = 3760
Step 17: 3760 + 235 = 3995
Step 18: 3995 + 235 = 4230

So, 235*18 = 4230