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Published byDonald Hawkins Modified over 8 years ago

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How do you ESTIMATE numbers? Use the skill of ROUNDING

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When do I 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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Try to Estimate the number of bricks used to build this portion of a chimney.

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15 Bricks tall 15 Bricks tall About 4 bricks long About 4 bricks long About 2 bricks wide About 2 bricks wide 15 x 4 x 2 = 120 bricks

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68,00068,24269,000 The population of the Sioux Reservation was 68,242. To the nearest thousand, what was the population? 68,242 is between 68,000 and 69,000, but it is closer to 68,000.

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9 8 7 6 5 4 3 2 1 +0 +1

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Round this number to the nearest ten thousand. Find your number. 3 6 8,9 7 1 Underline the number in the ten thousands place.

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Round this number to the nearest ten thousand. Look right next door. 3 6 8,9 7 1 Circle the digit to the right of the underlined number.

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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.

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Round this number to the nearest ten thousand. 5 or more, add 1 more. 3 6 8,9 7 1 Add 1 to the 6. +1

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Round this number to the nearest ten thousand. 5 or more, add 1 more. 3 7 0,0 0 0 Add 1 to the 6 and all the numbers to the right of the 7 become 0’s.

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The Answer 368,971 rounded to the nearest ten thousand is 3 7 0,0 0 0

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Round this number to the nearest thousand. Find your number. 3 5, 3 2 7 Underline 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 Circle to the right of the underlined 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 left 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 73,852 to the nearest… 1. Ten-thousand. 2. Thousand. 3. Hundred. 4. Ten. 70,00074,00073,90073,850

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

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Round this number to the nearest dollar. Look right next door. $ 5. 8 7 Circle to the right of the underlined 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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What about decimal numbers? The same rules (and poem) apply! Round 4.167 to the closest hundredths 4.167 Find your number Look right next door 4.17

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Round 2.197 to the closes hundredths Since there is a “9” in the hundredths place consider the tenth and hundredths together – 19 – do you leave it at 19 or move it to 20?

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Round 4.95 to the closest tenth Since there is a “9” in the tenth spot consider the ones and tenths together…… should you leave it at 49 or move it to 50? 4.95 rounded to the nearest tenth is 5.0

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Try these Round to tenths: 4.564.6 5.325.3 0.981.0 Round to hundredths 18.78418.78 9.456 9.46 9.997 10.00

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Round this number to the nearest tenth place. Find your number. 4. 8 7 1 Underline the number in the tenths place.

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Round this number to the nearest tenth place. Look right next door. 4. 8 7 1 Circle to the right of the Underlined number.

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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.

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Round this number to the nearest tenth place. 5 or more, add 1 more. 4. 8 7 1 Since 7 is greater than 5, add 1 to the 8. +1

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Round this number to the nearest tenth place. 5 or more, add 1 more. 4. 9 Change the 8 to a 9 and drop the numbers to the right of the 9.

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The Answer 4.871 rounded to the nearest tenth place is 4. 9

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The End Find your number. Look right next door. 4 or less just ignore. 5 or more, add 1 more.

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Remember If you are asked to round to the nearest tenth…….your answer stops at the tenth place! Example: Round 42.73 to the closest tenth would be 42.7

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