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Laabri

Open Up - Grade 7 - Mathematics - Unit 4 - Lesson 15

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"Source: Open Up Resouces (Download for free at openupresources.org.)"

Asemmisa {{asɛmmisaAhyɛnsode}}
1.

Jada measured the height of a plant in a science experiment and finds that, to the nearest

of an inch, it is

inches.

What is the largest the actual height the plant could be?

Asemmisa {{asɛmmisaAhyɛnsode}}
2.

Jada measured the height of a plant in a science experiment and finds that, to the nearest

of an inch, it is

inches.

What is the smallest the actual height the plant could be?

Asemmisa {{asɛmmisaAhyɛnsode}}
3.

Jada measured the height of a plant in a science experiment and finds that, to the nearest

of an inch, it is

inches.

How large could the percent error in Jada’s measurement be?

Asemmisa {{asɛmmisaAhyɛnsode}}
4.

Water is running into a bathtub at a constant rate. After 2 minutes, the tub is filled with 2.5 gallons of water. Write two equations for this proportional relationship. Use w for the amount of water (gallons) and t for time (minutes).

In each case, what does the constant of proportionality tell you about the situation?

Asemmisa {{asɛmmisaAhyɛnsode}}
5.

Noah picked 3 kg of cherries. Jada picked half as many cherries as Noah. How many total kg of cherries did Jada and Noah pick?

Asemmisa {{asɛmmisaAhyɛnsode}}
6.

The reading on a car’s speedometer has 1.6% maximum error. The speed limit on a road is 65 miles per hour.

The speedometer reads 64 miles per hour. Is it possible that the car is going over the speed limit?

Asemmisa {{asɛmmisaAhyɛnsode}}
7.

The reading on a car’s speedometer has 1.6% maximum error. The speed limit on a road is 65 miles per hour.

The speedometer reads 66 miles per hour. Is the car definitely going over the speed limit?

Asemmisa {{asɛmmisaAhyɛnsode}}
8.

Here is a shape with some measurements in cm.

Complete the table showing the area of different scaled copies of the triangle.

Is the relationship between the scale factor and the area of the scaled copy proportional?