I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Count the number of balls in picture below:

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

It is always ahead of me yet I can never see it. What is it?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Why is 6 afraid of 7?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

10+10 and 11+11 can give you the same answer.

Explain how?