Math topics

Math for grades 9–12

High school courses reuse algebra fluency: isolating variables, checking solutions, and reading expressions carefully. Tutorai’s free coach is available without accounts; progress remains on your device.

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Worked example

Problem. Solve for x: 3x − 6 = 9

1. Add 6 to both sides: 3x = 15.
2. Divide by 3: x = 5.
3. Check: 3(5) − 6 = 15 − 6 = 9.

Answer. 5

Practice set

1. Practice 1. Solve: x/2 = 9

   Show answer

   18

2. Practice 2. Expand: 2(x − 4)

   Show answer

   2x − 8

3. Practice 3. What is 20% of 50?

   Show answer

   10

Related pages

• Basic algebra
• One- and two-step equations
• Percentages

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