Math riddles for teens with simple answers

There is a word and six letters it contains. Take one away and twelve is what remains. What word is it?

Divide 110 into two parts so that one will be 150 percent of the other. What are the 2 numbers?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

How do you make the number 7 an even number without addition, subtraction, multiplication, or division?

What is the largest number you can write with just 3 digits?

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

As I was going to the mall I met a man with seven wives. Each wive held two bags, each bag held a mother cat, each mother cat had six babies, How many people were going to the mall?

Think of a number. Double it. Add ten. Half it. Take away the number you started with. What is your number?

On the first day they cover one quarter of the total distance. The next day they cover one quarter of what is left. The following day they cover two fifths of the remainder and on the fourth day half of the remaining distance. The group now have 14 miles left, how many miles have they walked?