There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What number do you get when you multiply all of the numbers on a telephone's number pad?

How many sides does a circle have?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

Why is the Hole below a Lock?

Who is that with a neck and no head, two arms and no hands? What is it?