OK, let's crack this. We're given 454 and our task is to multiply it by 7. Essentially, we'll be adding 454 to itself 7 times.
Step 1: 0 + 454 = 454
Step 2: 454 + 454 = 908
Step 3: 908 + 454 = 1362
Step 4: 1362 + 454 = 1816
Step 5: 1816 + 454 = 2270
Step 6: 2270 + 454 = 2724
Step 7: 2724 + 454 = 3178

So, 454*7 = 3178