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Published byDwight Fleming Modified over 8 years ago

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Math Flash Rounding

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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.

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Memorize this Poem Find your number. Look right next door. 4 or less just ignore. 5 or more, add 1 more.

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Use Place Value Carefully to Round! 1.Find the digit in the place you are asked to round to. (tens, hundreds or thousands) 2. Look right next door. Look at the number in the place to the right! 3. If the number in the place to the right is 4 or less “just ignore” and keep the digit the same. 4. If the number in the place to the right is 5 or more, you add 1 more to the digit.

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Round this number to the nearest ten. Find your number. 657 Circle the number in the tens place.

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Round this number to the nearest ten. Look right next door. 6 5 7 Draw an arrow to the right of the number. Look at the ones place.

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Round this number to the nearest ten. 5 or more, add one more. 6 5 7 Since 7 is more than 5 we “round up” and add one to the tens place.

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Round this number to the nearest ten. 5 or more, add one more. 6 6 0 Change the numbers in the ones place to 0 ’ s.

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The Answer 657 rounded to the nearest ten is 660

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Round this number to the nearest ten. Find your number. 8 4 4 Circle the number in the tens place.

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Round this number to the nearest ten. Look right next door. 8 4 4 Draw an arrow to the right of the number. Look at the ones place.

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Round this number to the nearest ten. 4 or less, just ignore. 8 4 4 Since there is a 4 in the ones place, you “just ignore” and keep the tens number the same.

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Round this number to the nearest ten. 4 or more, just ignore. 8 4 0 Change the numbers in the ones place to 0 ’ s and keep the number in the tens place the same.

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The Answer 844 rounded to the nearest ten is 840

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Round this number to the nearest hundred. Find your number. 7, 2 2 1 Circle the number in the hundreds place.

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Round this number to the nearest hundred. Look right next door. 7, 2 2 1 Draw an arrow to the right of the number.

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Round this number to the nearest hundred. 4 or less, just ignore. 7, 2 2 1 Since 2 is less than 4 we do not change the 2.

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Round this number to the nearest hundred. 4 or less, just ignore. 7,2 0 0 Change the numbers to the right of the 2 to 0 ’ s.

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The Answer 7221 rounded to the nearest hundred is 7,200

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Round this number to the nearest thousand. Find your number. 3 5, 3 2 7 Circle the number in the thousands place.

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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.

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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.

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Round this number to the nearest thousand. 4 or less, just ignore. 3 5, 0 0 0 Change the numbers to right of 5 to 0 ’ s.

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The Answer 35,327 rounded to the nearest thousand is 3 5, 0 0 0

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Round this number to the nearest dollar. Find your number. $ 5. 8 7 Circle the number where the dollars are.

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Round this number to the nearest dollar. Look right next door. $ 5. 8 7 Draw an arrow to the right of the circled number.

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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.

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Round this number to the nearest dollar. 5 or more, add 1 more. $ 5. 8 7 Since 8 is greater than 5 add 1 to the 5. +1

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Round this number to the nearest dollar. 5 or more, add 1 more. $ 6. 0 0 Change the 5 to a 6 and change all the numbers to the right to 0 ’ s.

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The Answer $5.87 rounded to the nearest dollar is $ 6. 0 0

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