**Predict:** I predict that this problem will be a worded problem and i will use subtraction.

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

**Clarify: **I have no words, sentences or phrases to clarify.

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

**Mathematician’s Toolbox: **Work backwards.

**Solve: **First I start by subtracting 4 from 20 which equals 16. Then I half 16 or divide it by 2 which equals 8. Just to double check I do 8×2+4=20.

**Summarise: **My prediction was correct because it was a worded problem and I did use subtraction. I also used my Mathematicians Toolbox strategy *work backwards* because I started at the back of the problem.