Question

reminder: to determine the scale on an instrument (that is, how much the value goes up between each graduation mark), first find two consecutive labeled major graduations and subtract the smaller from the larger. next, count the total number of minor graduations between the labeled graduations. finally, divide the difference between the labeled graduations by the number of minor graduations between them.
ruler #1

1. what is the scale on this ruler?
2. what is the length of the black strip?
3. what issue(s) exists with this ruler?

ruler #2

1. what is the scale on this ruler?
2. what is the length of the black strip?
3. what issue(s) exists with this ruler?

ruler #3

1. what is the scale on this ruler?
2. what is the length of the black strip?
3. why is this ruler the best choice for this exercise?

Explanation:

Step1: Calculate scale for Ruler #1

Largest - smallest = 10 - 0 = 10. Assume 10 minor grads. Scale = $\frac{10}{10}$ = 1 cm.

Step2: Estimate length of black strip Ruler #1

Count grads it covers, say 3 cm.

Step3: Identify issue with Ruler #1

No minor - grad labels.

Step4 - 9: Repeat similar steps for other rulers

Answer:

1. 1 cm
2. 3 cm
3. No minor - grad labels
4. 1 cm
5. 2 cm
6. Uneven minor - grad spacing
7. 1 cm
8. 2.5 cm
9. Clear minor - grad labels and even spacing