How does a double number line help you find percents?
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For example refer to the image given below. the point is 1/8

1/8 * 100

12.5%  ...........we found percentage through number line much more easily.

Step-by-step explanation:

Here in the figure the upper one represents the quantity and the lower one represents the percent. 20% of 75 = 15 which is shown in the figure. 60% of 75 is 45. So, in this way, a double number line helps you find percents.

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3