Decimal Addition and Estimation Concepts

The video tutorial explains how Janelle tracks her running distance over four days using a pedometer. It covers estimating the total distance by rounding each day's mileage to the nearest mile and then calculating the exact total by adding the decimal values. The estimated total is 22 miles, while the exact total is 22.55 miles, showing the estimation was close. The tutorial demonstrates rounding rules and decimal addition, emphasizing the importance of lining up decimal points when adding.

What device does Janelle use to track her running distance?

• Smartphone

• GPS Watch

• Heart Rate Monitor

• Pedometer

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CCSS.6.NS.B.3

How many miles did Janelle run on Sunday according to the pedometer?

• 3.35 miles

• 5.1 miles

• 10.21 miles

• 3.89 miles

When estimating, what is the rounded distance for 3.89 miles?

• 4 miles

• 5 miles

• 3 miles

• 6 miles

What is the estimated total distance Janelle ran over four days?

• 22 miles

• 21 miles

• 20 miles

• 23 miles

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CCSS.6.NS.B.3

What is the first step in adding decimal numbers?

• Align the numbers to the left

• Align the decimal points

• Subtract the smallest number

• Add from the left

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CCSS.5.NBT.B.7

What is the sum of 3.89 and 5.1 in the hundredths place?

• 0

• 5

• 9

• 15

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CCSS.5.NBT.B.7

What is the exact total distance Janelle ran over the four days?

• 24.55 miles

• 21.55 miles

• 22.55 miles

• 23.55 miles

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CCSS.5.NBT.B.7

What is the purpose of carrying over numbers in decimal addition?

• To simplify the process

• To make it faster

• To avoid mistakes

• To ensure accuracy

How close was the estimated distance to the exact distance?

• Exactly the same

• Within half a mile

• Within one mile

• More than one mile off

Why was the estimation considered reasonably accurate?

• It was more than a mile off

• It was within a mile

• It was within half a mile

• It was exactly correct