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Estimating to Solve Problems. Lesson 7. Why use estimation?. When solving problems, sometimes an exact answer isn’t needed. Amounts may be rounded and estimation used to calculate a solution. Place Value. 1,234,567,890.123456. What is the value of the 8 in each number?. 1,378,124 - PowerPoint PPT Presentation

Estimating to Solve ProblemsLesson 7

Why use estimation?When solving problems, sometimes an exact answer isnt needed. Amounts may be rounded and estimation used to calculate a solution.

Place Value 1,234,567,890.123456

What is the value of the 8 in each number?

1,378,12480,123,567321.05378103,21851.81261,085,241.4

How to RoundIf the digit following the indicated level of rounding is Less than 5

5 or greater

Round to the indicated value.752 (tens)6,555 (hundreds)752,357 (ten thousands)651.5021 (ones)635 (tens)75,500 (thousands)852.157 (hundredths)65.15 (tenths)

Is it better to over estimate or under estimate?Ms. Brown has 3 errands to run before a dentist appointment at 10:00 a.m.. To figure out when she should leave her house should she underestimate or overestimate the total time it will take to run these errands?

Is it better to over estimate or under estimate?Bill wants to buy a new mountain bike which sells for $375. He wants to estimate how long it will take him to save the money he needs based on his weekly earnings from his paper route. Should he underestimate or overestimate his weekly earnings?

Is it better to over estimate or under estimate?Mary is going to order the fabric for her bridesmaids dresses. Should she underestimate or overestimate the amount she needs for each dress?

On-Line HelpEstimation Practice (Basketball Simulation)Practice ProblemsEstimation GolfEstimator Game for Two (Four Square)

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Estimate the average score.

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Estimate the area of the rectangle.

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