Sure thing! We've got 841 and we're gonna multiply it by 4. That's the same as adding 841 to itself 4 times.
Step 1: 0 + 841 = 841
Step 2: 841 + 841 = 1682
Step 3: 1682 + 841 = 2523
Step 4: 2523 + 841 = 3364

So, 841*4 = 3364