Unit 4 Lesson 10 Estimate Products Use Rounding to Estimate Products.

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Presentation transcript:

Unit 4 Lesson 10 Estimate Products Use Rounding to Estimate Products

Help Eli out! Approximately how many yards did Peyton pass for in the last two seasons?

Round 42 to the nearest ten. Which ten is closer to 42? Round 762 to the nearest hundred. Which hundred is closer to 762? Round 0.86 to the nearest tenth. Which tenth is closer to 0.86? Round 0.263 to the nearest hundredth. Which hundredth is closer to 0.263?

Round to the nearest ten 46 85 928

Round to the nearest hundred 231 459 350

Round to the nearest tenth 0.73 0.15 0.483

Round to the nearest hundredth 0.532 0.609 0.165

What is the greatest number that can be rounded to 30? What is the least? What is the greatest decimal in hundredths that can be rounded to 14.5? What is the least?

For the next few problems, round the factors and multiply mentally to find the estimated answer. Then find the exact answer.

Estimate: 24 x 39 = Exact: 24 x 39 = Estimate: 151 x 32 = Exact: 151 x 32 =

Estimate: 0.74 x 0.2 = Exact: 0.74 x 0.2 = Estimate: 12.3 x 3.7 = Exact: 12.3 x 3.7 =

Is there more than one way to round these numbers? Why are some exact numbers closer to the estimated answer than others?

Tanya did these multiplications on her calculator. Which answers are clearly wrong?