AI Tutor
Imagine you crack a big mystery, but your detective partner asks: "How do you know for sure?"
In math, getting the right number is only half the job. To justify your answer, you have to explain why your math makes sense.
How do we build an explanation that anyone can follow?

The 3 Parts of an Explanation

A rock-solid mathematical explanation answers three simple questions for every move you make.
Let's put this three-part tool to work on a real story problem.

A Worked Example

Mia buys 44 packs of stickers with 66 stickers in each pack. Then, she gives 55 stickers to Leo. How many stickers does Mia have left?
First, we write: "I multiplied 4×6=244 \times 6 = 24 because Mia has 44 equal groups of 66, which gives 2424 stickers in total."
Next, we write: "Then, I subtracted 24−5=1924 - 5 = 19 because giving stickers away removes them from her total, leaving her with 1919 stickers."
What happens if we forget to write down our reasons?