Problem 23: I think of a number, multiply it by 3 and divide it by 2. If the result was 18, what was the original number?

Predict: I predict I will have to use multiplication in this problem.

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

Find the big question: what was the original number?

Solve:

- this sum is a little bit different than others I’ve done.
- first, I started with trying 18 / 2 x 3,thinking that definitely wouldn’t work.
- But then, I checked it and the answer was 24. But 24 x 3 /2 isn’t 18. It’s 36!
- So I tried 18 / 3 x 2.
- That was 12.
- So I double checked it; 12 x 3 / 2 and it was 18!

the answer is 12.

summary: the mathematicians toolbox strategy I used in this sum was use my prior knowledge.