OK, let's crack this. We're given 837 and our task is to multiply it by 7. Essentially, we'll be adding 837 to itself 7 times.
Step 1: 0 + 837 = 837
Step 2: 837 + 837 = 1674
Step 3: 1674 + 837 = 2511
Step 4: 2511 + 837 = 3348
Step 5: 3348 + 837 = 4185
Step 6: 4185 + 837 = 5022
Step 7: 5022 + 837 = 5859

So, 837*7 = 5859