What did one math book say to another?

I have so many problems

How can you add eight 8's to get the number 1000?

888 + 88 + 8 + 8 + 8 = 1000

How can you make six into an odd number?

Remove the letter S and you have IX which is 9 in roman numerals

How many 9's are there between 1 and 100

20

When I take five and add six, I get eleven, but when I take six and add seven, I get one. What am I?

Clock

Riya is 54 years old and her mother is 80, how many years ago was Riya’s mother three times her age?

Forty-one

In two years I know, I'll be twice as old as five years ago, said Ram. How old is Ram?

12

Why is the longest human nose on record is only 11 inches long?

Because Then It Wouldn't Be A Nose Any More; It Would Become A Foot! (12 Inches And Above)

I am a three digit number. My second digit is 4 times bigger than the third digit. My first digit is 3 less than my second digit. Who am I?

141

I am an odd number; take away an alphabet and I become even. What number am I?

7 (SEVEN-S=EVEN)