Answers:

Which of the following affects the accuracy of measurements?

A. the unit of measure

Unit of measure greatly affects the accuracy of measurement, one must properly incorporate the correct unit of measurement of a certain object. With that, it is easier to determine what kind of device should be used.

What is the appropriate unit of measure for the mass of a steel cabinet?

C. kilogram

Normally, a heavy object like steel are measured by kilogram, if ever its mass is greater than a thousand kilogram, tons can be used as its unit of measurement.

Which is the best estimate of temperature of cold glass of fruit juice in degree  Celsius?

B. 10

In zero degree Celsius, water freezes at standard operating pressure, thus a fruit juice may freeze below zero. Temperature of 10 degree Celsius is considered cold but not freezing, therefore it is the best estimate for a cold drink.

Estimate the given angle on the right.

C. 45°

Use a protractor to get a good estimation of an angle.

If your forearm length is 40cm and you are about to measure a plywood to be  used as the wall of your bedroom, how long is the plywood if you measured 6  forearm length?

D. 240cm

The measurement of a forearm is 40 centimeters, that is 40 cm per forearm. The plywood measured 6 forearm length. Therefore, the total length of the plywood is 40 x 6 = 240 centimeters.

From school, Rosa lives three times as far as Cyndi. If Rosa’s house is 4.726  kilometers away from the school, how far is Cyndi’s house?

B. 1.58

Rosa lives 3x Cyndi's, if Rosa's house is 4.726 kilometers away from school, therefore Cyndi's house is approximately 1.58 kilometers away. Since Rosa lives 3 times farther than Cyndi, divide 4.726 km by 3. Thus, giving 1.5753 km.

How many meters of wood are needed to completely surround a square whose  side is 0.427 meter?

B. 2 meters

Perimeter of a square is equal to 4 times the length of its side. That's 0.427

meters x 4 equal to 1.71 meters or approximately two meters.

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