4200 is the answer because you need to round the 19 to 20 and then round the 213 to a 210 because 3 is lower than 5 and you can only round up when it is 5 or above then you multiply 0 times 0 is 0 add another zero because 0 * 2 is 0 and then you move down add 1 0 and multiply again 1 *0 is 0 1 * 2 is 2 then you move down add two zeros and multiply you for your last time 2 * 0 is 0 + 2 * 2 is 4 then once you've done all that you put a line under it signifying your addition and add your adding sign right in between the last two numbers you have put and you add which will give you a total of 4200. I hope I helped thank you