3Rounding RapYo, this is a story all about how My math got twisted upside down, I’d like to take a minute so sit right here I’ll tell you how I got from here to there. First find the place, okay get it Arrow to the right, underline the digit, 5 or above, give it a shove-- 4 or less, stay at rest. Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And that’s how its done in the rounding game! PEACE OUT!!
4Estimation is ...Estimation is finding a number that is close enough to the right answer.You are not trying to get the exact right answer What you want is something that is good enough (usually in a hurry!)
5When to use rounding… When the question asks you to estimate. When the question asks “about how many”…?When an exact answer isn’t possible.When an answer is difficult to obtain.
33Nearest Hundred Round each number to the nearest hundred and then add. ,964 =A. 3,400B. 4,100C. 4,300D. 4,000C
34Estimate by rounding to the nearest hundred. What numbers should you use to estimate 641 plus 378?ABCDB
35Round each number to the nearest hundred, and then solve. =392 – 182 ==648 – 322 ==858 – 524 =
36Which of the following should you use to estimate 5,789 – 4,678 to the nearest thousand? A. 5,000 –5,000 B. 6,000- 5,000 C. 6,000-4,000 D. 5,700-4,700B
37Round each number to the nearest thousand and then subtract Round each number to the nearest thousand and then subtract. 7,345 – 3,446 A. 4,000 B. 3,000 C. 5,000 D. 2,000A
38Round each number to the nearest thousand, and then solve. 4, ,257 =4,832 – 1,222 =4, ,465 =8,642 – 2,468 =9, ,833 =8,478 – 1,454 =
39Estimation Remember Estimation is not an exact answer It should be around the answer, but not exactly it.Round the numbers first, then calculate.Use Mental Math and Rounding to make numbers easier to work with.