Number Classification

What is the best classification for this number?  
π

• integer
• rational
• irrational
• imaginary

What is the best classification for this number?  .78787878...

• integer
• rational
• irrational
• whole

What is the best classification for this number?   √16

• rational
• whole
• integer
• real

What is the best classification for this number?   .35

• whole
• rational
• irrational
• real

Classify the number -2.5

• Real, rational

• Real, rational, integer

• Real, irrational