Let's roll up our sleeves and solve this. We have 249 and we're going to multiply it by 10, essentially adding 249 to itself 10 times.
Step 1: 0 + 249 = 249
Step 2: 249 + 249 = 498
Step 3: 498 + 249 = 747
Step 4: 747 + 249 = 996
Step 5: 996 + 249 = 1245
Step 6: 1245 + 249 = 1494
Step 7: 1494 + 249 = 1743
Step 8: 1743 + 249 = 1992
Step 9: 1992 + 249 = 2241
Step 10: 2241 + 249 = 2490

So, 249*10 = 2490