Sure thing! We've got 899 and we're gonna multiply it by 4. That's the same as adding 899 to itself 4 times.
Step 1: 0 + 899 = 899
Step 2: 899 + 899 = 1798
Step 3: 1798 + 899 = 2697
Step 4: 2697 + 899 = 3596

So, 899*4 = 3596