Let's get this math done. We have 310 and we're going to multiply it by 5. This is the same as taking 310 and adding it to itself 5 times.
Step 1: 0 + 310 = 310
Step 2: 310 + 310 = 620
Step 3: 620 + 310 = 930
Step 4: 930 + 310 = 1240
Step 5: 1240 + 310 = 1550

So, 310*5 = 1550