Test_proporzioni_numeri decimali e periodici

What is the definition of direct proportion?

• Direct proportion is a mathematical relationship between two variables where their ratio remains constant.

• Direct proportion is a mathematical relationship between two variables where their ratio decreases linearly.

• Direct proportion is a mathematical relationship between two variables where their ratio increases exponentially.

• Direct proportion is a mathematical relationship between two variables where their ratio changes randomly.

If x and y are directly proportional, and x = 4 when y = 10, what is the value of y when x = 8?

• 20

• 25

• 15

• 5

What is the definition of inverse proportion?

• Inverse proportion is a mathematical relationship between two variables in which an increase in one variable leads to an increase in the other variable.

• Inverse proportion is a mathematical relationship between two variables in which the variables are unrelated to each other.

• Inverse proportion is a mathematical relationship between two variables in which an increase in one variable leads to no change in the other variable.

• Inverse proportion is a mathematical relationship between two variables in which an increase in one variable leads to a decrease in the other variable, and vice versa.

If x and y are inversely proportional, and x = 6 when y = 12, what is the value of y when x = 3?

• 18

• 9

• 24

• 6

Convert the decimal number 0.75 into a fraction.

• 2/3

• 1/2

• 3/4

• 4/5

Convert the fraction 5/8 into a decimal number.

• 0.85

• 0.75

• 0.45

• 0.625

What is the definition of a periodic number?

• A periodic number is a number that has a repeating pattern of digits after the decimal point.

• A periodic number is a number that has a repeating pattern of digits within the whole number part.

• A periodic number is a number that has a non-repeating pattern of digits after the decimal point.

• A periodic number is a number that has a repeating pattern of digits before the decimal point.

Write the decimal representation of the periodic number 0.333...

Solve the proportion: 3/5 = x/20

• 12

• 4

• 6

• 8

A car travels 240 km in 4 hours. What is its average speed in km/h?

• 80

• 120

• 60

• 40