Introduction to Rational and Irrational Numbers

Which numbers are rational numbers?

• 7

• 0.5

Which numbers are irrational?

Which numbers below are rational?

• 7

_____________ number is a number that cannot be written as a ratio of two integers.

• An integer

• A rational

• An irrational

• A repeating

Is the result rational or irrational? Explain.

• Rational; The sum of two rationals is always rational.

• Irrational; The sum of a rational and an irrational is always irrational.

• Rational; The product of two rationals is always rational.

• Irrational; The product of a nonzero rational and an irrational is always irrational.

Is .141414141414... rational or irrational?

• Rational 

• Irrational 

Which numbers below are irrational?

What is a Rational Number?

• A number that can be expressed as a fraction

• A number that cannot be expressed as a fraction

• A number that is only positive

• A number that is only negative

What is 0.625 written as a fraction?

What is 0.25 written as a fraction?

• 1/4

• 1/2

• 2/4

• 3/4