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© 2007 M. Tallman

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Look right next door. 3. Find your number. 7 Round to the nearest one (units). 4 Step 1: Circle the digit in the place that you must round to. Step 2: Draw an arrow to the place on the right.

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© 2007 M. Tallman 0 073 4 or less, just ignore.. 4 Step 1: Circle the digit in the place that you must round to. Step 2: Draw an arrow to the place on the right. Step 3: If the number is four or less, then the circled number stays the same. Step 4: All numbers to the right of the circled number become zeros, or disappear. 3 is less than 4 Just Ignore! Round to the nearest tenth.

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© 2007 M. Tallman 4.37 rounded to the nearest one (unit) is… 4 4 5 4.37 4.37 is closer to 4 on the number line.

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© 2007 M. Tallman Look right next door. 8. Step 1: Circle the digit in the place that you must round to. Step 2: Draw an arrow to the place on the right. Find your number. Round to the nearest one (units). 2

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803 4 or less, just ignore.5 or more, add 1 more. Step 1: Circle the digit in the place that you must round to. Step 2: Draw an arrow to the place on the right. Step 3: If the number is four or less, then the circled number stays the same. Step 4: If the number is 5 or greater, then add 1 to the circled number. Step 5: All numbers to the right of the circled decimal number become zeros, or disappear. 8 is not less than 4 2 + 1 = 3. 2 Round to the nearest one (units).

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© 2007 M. Tallman 2.8 rounded to the nearest one (unit) is… 3 2 32.8 2.8 is closer to 3 on the number line.

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© 2007 M. Tallman 17.4 + 4.8 17 5 + = 22 Step 1: Rounding is always first. Decide which place to round to. Step 2: Round each addend to the nearest whole number. The actual answer is 22.2, so our estimation is pretty accurate. Step 3: Now you can add 17 and 5 mentally.

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© 2007 M. Tallman 9.7 + 2.8 10 3 + = 13 Step 1: Rounding is always first. Decide which place to round to. Step 2: Round each addend to the nearest whole number. The actual answer is 12.5, so our estimation is pretty accurate. Step 3: Now you can add 10 and 3 mentally.

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© 2007 M. Tallman 42.8 + 6.3 43 6 + = 49 Step 1: Rounding is always first. Decide which place to round to. Step 2: Round each addend to the nearest whole number. The actual answer is 49.1, so our estimation is pretty accurate. Step 3: Now you can add 43 and 6 mentally.

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© 2007 M. Tallman 1. 19.76 + 9.55 $24.00 23 15+ 8 = 15 7 + 8 = 30 4. $23.87 + $6.70 3. 14.7 + 8.3 Estimate Each Sum 2. 7.45 + 8.56 20 + 10 = $31.00 + $7.00 =

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© 2007 M. Tallman $103.00 5. 13.56 + 4.4 $5.00 $112.00 $9.00+ = 17 1 + 16 = 18 8. $4.77 + $28.70 7. $9.33 + $102.5 Estimate Each Sum 6. 0.78 + 15.89 14 + 4 = $34.00 + $29.00 =

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© 2007 M. Tallman $2.00 9. $3.26 + $14.67 0 $32.00 $30.00+ = 39 6 + 33 = $18.00 12. 0.23 + 12.67 11. $29.53 + $2.45 Estimate Each Sum 10. 6.42 + 33.31 $3.00 + $15.00 = 13 + 13 =

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