OK, let's crack this. We're given 248 and our task is to multiply it by 19. Essentially, we'll be adding 248 to itself 19 times.
Step 1: 0 + 248 = 248
Step 2: 248 + 248 = 496
Step 3: 496 + 248 = 744
Step 4: 744 + 248 = 992
Step 5: 992 + 248 = 1240
Step 6: 1240 + 248 = 1488
Step 7: 1488 + 248 = 1736
Step 8: 1736 + 248 = 1984
Step 9: 1984 + 248 = 2232
Step 10: 2232 + 248 = 2480
Step 11: 2480 + 248 = 2728
Step 12: 2728 + 248 = 2976
Step 13: 2976 + 248 = 3224
Step 14: 3224 + 248 = 3472
Step 15: 3472 + 248 = 3720
Step 16: 3720 + 248 = 3968
Step 17: 3968 + 248 = 4216
Step 18: 4216 + 248 = 4464
Step 19: 4464 + 248 = 4712

So, 248*19 = 4712