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Write the Answers… Is 86 closer to 80 or 90? 90 Is 538 closer to 500 or 600? 500 Write the Answers… Is 541 closer to 540 or 550? 540 Is 786 closer to 780 or 790? 790 Write the Answers… Is 2, 670 closer to 2, 000 or 3, 000? 3, 000 Is 2, 670 closer to 2, 600 or 2, 700? 2, 700 Write the Answers… Is 75 closer to 70 or 80? It’s exactly half way which means you round up, to the higher number 80 Is 250 closer to 200 or 300? 300 Math Message A newspaper reported that 20, 344 participants ran in the 2004 Boston Marathon. Do you think that number is exactly correct? Explain your answer BrainPop: Decimals BrainPOP | Rounding http://www.brainpop.com/math/numbersandope rations/rounding/ 1994: 9, 059 2004: 20, 344 Do you think exactly that many people ran in each race? Why or why not How do you think the counts of runners were obtained? Rounding numbers to a certain place value Round 20, 344 to the nearest hundreds place 1) Mark the digit in the place you are rounding 20, 344 Rounding numbers to a certain place value Round 20, 344 to the nearest hundreds place 1) Mark the digit in the place you are rounding 20, 344 2) Look at the number to the right of the underlined digit. 20, 344 If it is 5 or more, add one more If it is 4 or less just ignore (and replace all digits to the tight with zeros.) Rounding numbers to a certain place value Round 20, 344 to the nearest hundreds place 1) Mark the digit in the place you are rounding 20, 344 2) Look at the number to the right of the underlined digit. 20, 344 If 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 digit 20, 344 3) Replace all the digits to the right of the underlined digit/place you are rounding to with zeros 20, 300 Rounding numbers to a certain place value Remember our steps!! Underline, Rounding Poem, and replace with zeros o o o Round 9, 059 to the nearest thousand 9, 059 9, 000 Round 9, 059 to the nearest hundred 9, 059 9, 100 Round 9, 059 to the nearest ten 9, 059 9, 060