when you are finding the estimate of a number, you're looking for the closest number to the right answer.
567 789 (or est. 600 000) + 235 051(or set. 200 000) = 802 840 OR estimate of 800 000
Round off any number that is followed by 5 up to the next higher number
(For example, 357 becomes 400 because 3 is followed by a 5; one more ex: 2 490 becomes 2 000 because 2 is followed by 4 which is less than 5)
