Lessons 21-24

Question 1

When you have the average and all but one of the numbers that make it, how do you find the final one?

Answer 1

You multiply the number that is the average by the number of numbers that go into it and then subtract the numbers that you do know.

Question 2

How do you go about multiplying three or more fractions?

Answer 2

You start by canceling, try to match with common factors in mind. Then you reduce them and multiply the reduced terms. When one of the fractions is to be divided, put the reciprocal and multiply as directed above.

Question 3

When a number is combined with a measurement word (such as feet or meters) what is it called, and what is the word called?

Answer 3

A denominate number, the word is called a unit (of measurement.)

Question 4

How many feet are in a mile?

Answer 4

5,280

Question 5

How many ounces are in a pound?

Answer 5

16

Question 6

How many pounds are in a ton?

Answer 6

2,000

Question 7

What do you do when you multiply a number by a fraction that is equal to one?

Answer 7

Change the numerator but keep the denominator (e.g. 5 • 3/5 = 15/3).

Question 8

What is a unit multiplier?

Answer 8

A fraction using units that are equal (e.g. 12 in./1 ft.)

Question 9

How many feet are in a meter?

Answer 9

About 3.

Question 10

How many pounds are in a kilogram?

Answer 10

About 2.2 pounds.

Question 11

What are the metric prefixes?

Answer 11

Kilo-, hecto-, deka-, (standard), deci-, centi-, milli-.