AI Tutor
Imagine holding two mystery gift bags and 5 extra loose marbles. If you count 21 marbles altogether, how can we write this math mystery in one neat line?
We use a letter called a variable to stand for the unknown number of items inside each bag.
How do we break down any mystery story into math symbols?

Parts of a Two-Step Equation

A two-step equation is a math sentence that uses two operations, like multiplying and adding, to find an unknown value.
Writing 2n2n means 2×n2 \times n, which counts how many total items are in the equal groups.
What does this look like with real word clues?

Step-by-Step Word Problems

Let's read a story: Leo buys 3 packs of stickers and gets 4 bonus stickers for a total of 19 stickers.
First, pick a letter for the unknown stickers in one pack, like ss. Then write the equal groups as 3s3s, add the 4 bonus stickers, and set it equal to 19: 3s+4=193s + 4 = 19