You round it up by changing the number to the nearest ten, hundred, thousand so on. Round the numbers first the use math to help estimate your answer. If the number is 5 or less so 12345 round down and if it's 6789 or 10 round up like 453=450 28=30
Like if you have 25 and it tells you to round the whole number to the nearest tens place then you would look at the number on the right if it is bigger than you add 1 to the number on the left and turn the 5 in to a 0 so you would come up with 30.
Step-by-step explanation: Like if you have 25 and it tells you to round the whole number to the nearest tens place then you would look at the number on the right if it is bigger than you add 1 to the number on the left and turn the 5 in to a 0 so you would come up with 30.
18 minutes because 6*2 is 12 and 3*6 is 18. it will take 6 minutes to do 4 problems, 9 minutes to do 6 problems , 12 minutes to do 8 problems, 15 minutes to do 10 problems, and 18 minutes to do 12 problems
