Rounding:
If you are estimating you have to ask yourself some questions. For example if you had the number 218 you can either choose to round to the nearest one, ten, or hundred since it's a three digit number. Now let's say you are rounding to the nearest ten, you look at the digit beside the tens place value which is 8. Now you ask yourself is 8 higher than 5? Or lower than 5? Or you can ask yourself is 8 closer to ten? Or closer to 1? Of course 8 is closer to ten so now the number 218 turns into 220.
Estimating:
Estimating, when you are estimating maybe for an assignment or a test it's almost the same concept with rounding. For example, if you have a question asking you, estimate the total cost of the T.V and the sofa. T.V costs $499.99 and the sofa costs $239.99. Let's round the cost of the T.V to the nearest hundred, now you look at the next digit beside the hundreds place which is 9, so is 9 closer to 10? Or closer to 1? 9 is closer to 10, so now $499.99 tunrs into $500. Now when you are estimating the cost of the sofa which is 239.99, it is pretty much the same concept, you look at the digit beside the hundreds place, which is 3, so is 3 closer to 10? Or closer to 1? 3 is closer to 1. Now, 239.99 turns into $200. After you are done rounding the prices you add them together. 500+200= $700.00 and that is your estimated answer. If you calculate the real price 499.99+239.99= $739.98, so this estimate is close to the real answer.
