Math Riddles

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

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

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

Our product and our sum always give the same answer. Who are we?

How do you go from 98 to 720 using just one letter?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.