**Predict:** I predict it is going to be about addition and multiplication.

**Read:** I think of a number, double it and then add 4. If the result is 20,what was the original number?

**Clarify:** None

**Big Question: **What was the original number?

**Mathematicians Toolbox:** Have I seen a similar problem?

**Solve: **First I thought what number could be doubled then add 4 to get 20 it was pretty obvious that the original number is 8.

**Summary:** It was really quite easy knowing addition and multiplication.