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Rounding
 

Rounding

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    Rounding Rounding Presentation Transcript

    • Rounding Numbers
    • When do you 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.
    • Memorize this Poem Find your number. Look right next door. 4 or less you just ignore. 5 or up, add 1 more. Are we done yet? No, not quite. Add zeroes to the right.
    • Round this number to the nearest ten thousand. Find your number. 3 6 8,9 7 1 Circle the number in the ten thousands place.
    • Round this number to the nearest ten thousand. Look right next door. 3 6 8,9 7 1 Draw an arrow to the right of the number.
    • Round this number to the nearest ten thousand. 4 or less, just ignore. 3 6 8,9 7 1 8 is larger than 4 so go to the next line of the poem.
    • Round this number to the nearest ten thousand. 5 or up, add 1 more. 3 6 8,9 7 1 Add 1 to the 6. +1
    • Round this number to the nearest ten thousand. Are we done yet? No, not quite. Add zeroes to the right. 3 Add 1 to the 6. 6 8,9 7 1 7 0,000
    • The Answer 368,971 rounded to the nearest ten thousand is 3 7 0,0 0 0
    • Round this number to the nearest thousand. Find your number. 3 5, 3 2 7 Circle the number in the thousands place.
    • Round this number to the nearest thousand. Look right next door. 3 5, 3 2 7 Draw an arrow to the right of the number.
    • Round this number to the nearest thousand. 4 or less, just ignore. 3 5, 3 2 7 Since 3 is less than 4 we do not change the 5.
    • Round this number to the nearest thousand. 4 or less, just ignore. 3 5, 327
    • Round this number to the nearest thousand. 4 or less, just ignore. 3 5, 0 0 0 327 Are we done yet? No, not quite. Add zeroes to the right.
    • The Answer 35,327 rounded to the nearest thousand is 3 5, 0 0 0
    • Round this number to the nearest dollar. Find your number. $ 5. 8 7 Circle the number where the dollars are.
    • Round this number to the nearest dollar. Look right next door. $ 5. 8 7 Draw an arrow to the right of the circled number.
    • Round this number to the nearest dollar. 4 or less, just ignore. $ 5. 8 7 8 is greater than 4 so go to the next line of the poem.
    • Round this number to the nearest dollar. 5 or up, add 1 more. $ 5. 8 7 Since 8 is greater than 5 add 1 to the 5. +1
    • Round this number to the nearest dollar. 5 or more, add 1 more. $ 6. 5 0 0 87 Are we done yet? No, not quite. Add zeroes to the right.
    • The Answer $5.87 rounded to the nearest dollar is $ 6. 0 0
    • Round this number to the nearest tenth place. Find your number. 4. 8 7 1 Circle the number in the tenths place.
    • Round this number to the nearest tenth place. Look right next door. 4. 8 7 1 Draw an arrow to the right of the circled number.
    • Round this number to the nearest tenth place. 4 or less just ignore. 4. 8 7 1 7 is greater than 4 so go to the next line of the poem.
    • Round this number to the nearest tenth place. 5 or up, add 1 more. 4. 8 7 1 Since 7 is greater than 5, add 1 to the 8. +1
    • Round this number to the nearest tenth place. 5 or up, add 1 more. 4. Are we done yet? No, not quite. Add zeroes to the right. 9 871 00
    • The Answer 4.871 rounded to the nearest tenth place is 4. 900
    • Round this number to the nearest whole number. Find your number. 4. 8 7 1 Circle the number in the ones place.
    • Round this number to the nearest tenth place. Look right next door. 4. 8 7 1 Draw an arrow to the right of the circled number.
    • Round this number to the nearest tenth place. 4 or less just ignore. 4. 8 7 1 8 is greater than 4 so go to the next line of the poem.
    • Round this number to the nearest tenth place. 5 or up, add 1 more. 4. 8 7 1 Since 8 is greater than 5, add 1 to the 4. +1
    • Round this number to the nearest tenth place. 5 or up, add 1 more. 4. Are we done yet? No, not quite. Add zeroes to the right. 5. 871 000
    • The Answer 4.871 rounded to the nearest whole number 5. 000