Basic Real Number

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.

• A rational number can be a pi.

Integers, whole numbers, and counting numbers are a subset of ______________.

• Irrational Numbers

• Rational Numbers only

• Real numbers only

• Rational and Real numbers

Which one is correct?

• π is rational.

• 0 is whole number.

• √5 is rational.

• (-3)² = -9

Transform  $2\frac{25}{99}$   to repeating decimal form.

• 2.2555...

• 2.525252...

• 2.252525...

• 2.25

Transform  $\frac{5243}{9900}$  to repeating decimal form.  

• 0.5243

• 0.52434343...

• 0.52858585...

• 0.52959595...

Square root of -100 is?

• 10

• -10

• 10, -10

• Can’t find the value.

Which one isn’t Integer number.

•  $\frac{9}{1}$  

• 0

• -√121

•  $\pi$  

Which one is rational number.

•  $\frac{22}{7}$  

• 0.12784...   

•  $\sqrt{7}$  

•  $\sqrt{821}$  

Which one isn’t Real number.

• -81

• $\sqrt{555}$

• $-\pi$

• $\infty$

Find the value of $4\sqrt{2}-5\sqrt{2}+2\sqrt{2}$  

•  $\sqrt{2}$  

• 0

•  $11\sqrt{2}$  

•  $-\sqrt{2}$