That's 2 decimal places (2dp). If you have not learned of significant figures yet, don't worry about it. FYI, here, 2sf would be equivalent to 0dp (because you would have just the 3 and 8 digits and no decimals). So 0 dp is good, but if that sounds strange to you 1dp is good also. 2dp is a bit too accurate for the numbers we based our calculations on.