Number System

The natural numbers are also called counting numbers.

• True

• False

Which number is irrational?

• 1/2

• 4

Classify 15 in the real number system.

• Natural, Whole, Integer, Rational, Real

• Irrational, Real

• Natural, Whole, Rational, Irrational, Real

Indicate the two integers.

• 11/5, 7

• -6, 6

• 21/8, 4

Classify 15 in the real number system.

• Natural, Whole, Integer, Rational, Real

• Irrational, Real

• Natural, Whole, Rational, Irrational, Real

Classify 0 in the real number system.

• Natural, Whole, Integer, Rational, Real

• Natural, Integer, Irrational, Real

• Whole, Integer, Rational, Real

A number can be rational and irrational.

• True

• False

Natural numbers are:

• 1.5, 2, 2.5, 3, . . .

• 0,1,2,3,4,5...

• 1, 2, 3, 4, . . .

• . . . , -2, -1, 0, 1, 2, . . .

What is true about irrational numbers?

• They are terminating decimals.
• They are non-repeating decimals.
• They are fractions.
• They are natural numbers.

What is the best classification for this number?  
π

• integer
• rational
• irrational
• imaginary