Write the Answers…Write the Answers…

Is 86 closer to 80 or 90?Is 86 closer to 80 or 90?

9090

Is 538 closer to 500 or 600?Is 538 closer to 500 or 600?

500500

Write the Answers…Write the Answers…

Is 541 closer to 540 or 550?Is 541 closer to 540 or 550?

540540

Is 786 closer to 780 or 790?Is 786 closer to 780 or 790?

790790

Write the Answers…Write the Answers…

Is 2, 670 closer to 2, 000 or 3, 000?Is 2, 670 closer to 2, 000 or 3, 000?

3, 0003, 000

Is 2, 670 closer to 2, 600 or 2, 700?Is 2, 670 closer to 2, 600 or 2, 700?

2, 7002, 700

Write the Answers…Write the Answers…

Is 75 closer to 70 or 80?Is 75 closer to 70 or 80?

It’s exactly half way which means It’s exactly half way which means you round up, to the higher numberyou round up, to the higher number

8080

Is 250 closer to 200 or 300?Is 250 closer to 200 or 300?

300300

Math MessageMath Message

A newspaper reported that 20, 344 A newspaper reported that 20, 344 participants ran in the 2004 Boston participants ran in the 2004 Boston Marathon. Do you think that number Marathon. Do you think that number is exactly correct? Explain your is exactly correct? Explain your answeranswer

BrainPop: DecimalsBrainPop: Decimals

BrainPOPBrainPOP | Rounding | Rounding

http://www.brainpop.com/math/numbehttp://www.brainpop.com/math/numbersandoperations/rounding/rsandoperations/rounding/

1994: 9, 0591994: 9, 059

2004: 20, 3442004: 20, 344

Do you think exactly that many people Do you think exactly that many people ran in each race? Why or why notran in each race? Why or why not

How do you think the counts of How do you think the counts of runners were obtained? runners were obtained?

RoundingRoundingnumbers to a certain place valuenumbers to a certain place value

Round 20, 344 to the nearest hundreds Round 20, 344 to the nearest hundreds placeplace

1) Mark the digit in the place you are 1) Mark the digit in the place you are roundingrounding

20, 20, 334444

RoundingRoundingnumbers to a certain place valuenumbers to a certain place value

Round 20, 344 to the nearest hundreds placeRound 20, 344 to the nearest hundreds place1) Mark the digit in the place you are rounding1) Mark the digit in the place you are rounding 20, 20, 334444

2) Look at the number to the right of the 2) Look at the number to the right of the underlined digit. underlined digit.

20, 20, 334444 If it is 5 or more, add one moreIf it is 5 or more, add one more

If it is 4 or less just ignore (and replace all If it is 4 or less just ignore (and replace all digits to the tight with zeros.)digits to the tight with zeros.)

RoundingRoundingnumbers to a certain place valuenumbers to a certain place value

Round 20, 344 to the nearest hundreds placeRound 20, 344 to the nearest hundreds place1) Mark the digit in the place you are rounding1) Mark the digit in the place you are rounding

20, 20, 334444

2) Look at the number to the right of the underlined digit. 2) Look at the number to the right of the underlined digit.

20, 20, 334444

If it is 0, 1, 2, 3, 4 the underline digit stays the sameIf it is 0, 1, 2, 3, 4 the underline digit stays the same

If it is 5, 6, 7, 8, 9, add 1 to the underlined digitIf it is 5, 6, 7, 8, 9, add 1 to the underlined digit

20, 20, 334444

3) Replace all the digits to the right of the 3) Replace all the digits to the right of the underlined digit/place you are rounding to underlined digit/place you are rounding to with zeroswith zeros

20, 20, 330000

RoundingRoundingnumbers to a certain place valuenumbers to a certain place value

Remember our steps!! Underline, Rounding Remember our steps!! Underline, Rounding Poem, and replace with zerosPoem, and replace with zeros

o Round 9, 059 to the nearest thousandRound 9, 059 to the nearest thousand99, 059, 059

9, 0009, 000o Round 9, 059 to the nearest hundredRound 9, 059 to the nearest hundred

9, 9, 0059 59 9, 9, 110000o Round 9, 059 to the nearest tenRound 9, 059 to the nearest ten 9, 09, 05599 9, 0609, 060