OK, let's crack this. We're given 40 and our task is to multiply it by 7. Essentially, we'll be adding 40 to itself 7 times.
Step 1: 0 + 40 = 40
Step 2: 40 + 40 = 80
Step 3: 80 + 40 = 120
Step 4: 120 + 40 = 160
Step 5: 160 + 40 = 200
Step 6: 200 + 40 = 240
Step 7: 240 + 40 = 280

So, 40*7 = 280