Question

1. circle which of the following would be the best referent to measure the length: a) the diameter of a soccer ball b) the width of a cell phone c) the diameter of a two - dollar coin d) the length of a pen
2. estimate the width of spongebobs eye glasses frame in inches using a referent. state the referent that you used.
3. state the measurement of: a) the metric ruler for lengths a and b.

a
b
0 cm 1 2 3 4 5 6 7
b) the imperial ruler for length c, as a reduced mixed fraction.
c
d
0 inch 1 2 3 4

Explanation:

Step1: Analyze question 1

The diameter of a two - dollar coin is a small and common object for length reference. A soccer ball is too large, a cell phone width is not a standard length reference for general measurements, and the length of a pen is longer than what is usually used as a basic length reference. So the best referent is the diameter of a two - dollar coin.

Step2: Analyze question 2

This requires personal estimation. For example, if we use the width of a finger (about 1 inch) as a referent, we can estimate the width of SpongeBob's eyeglasses' frame. But without a specific picture size, it's a subjective estimate.

Step3: Analyze question 3a

On the metric ruler, length A is at the 2 - cm mark and length B is at the 5.5 - cm mark.

Step4: Analyze question 3b

On the imperial ruler, if we assume each small division is 1/16 of an inch. Length C is at 1 and 9/16 inches.

Answer:

1. c) The diameter of a two - dollar coin
2. (Answer depends on personal estimation and referent chosen, e.g., Using the width of a finger as a referent, estimate is 2 inches)
3. a) A: 2 cm, B: 5.5 cm

b) 1$\frac{9}{16}$ inches