Introduction to Rational and Irrational Numbers

What is a rational number ?

• A rational number is a number that cannot be written as a fraction.

• A rational number is a number that can be written as a fraction.

• A rational number cannot be a repeating decimal.

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CCSS.5.NBT.A.2

.141414141414...

• Rational 
• Irrational 
• real
• fake

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CCSS.7.NS.A.2D

CCSS.8.NS.A.1

A fraction is which type of number?

• Rational
• Irrational

A perfect square is which type of number?

• Rational 
• Irrational

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CCSS.8.NS.A.1

What is 3/9 written as a decimal?

• 3.9
• 0.3333...
• 9.3333...
• 15

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CCSS.7.NS.A.2D

CCSS.8.NS.A.1

What number is an integer?

• 1/2
• Pi
• -4
• Square root of 3

The number -8 belongs to what number set(s)?

• percent

• fraction

• irrational

• Integer and Rational

True or False: 
17/5 can be written as a decimal.

• True
• False

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CCSS.7.NS.A.2D

CCSS.8.NS.A.1

What type of number is 1/3 when it is converted to a decimal?

• A repeating decimal 
• A whole number

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CCSS.7.NS.A.2D

CCSS.8.NS.A.1

√7 (square root)

• Rational 
• Irrational
• real
• fake