Frequently asked questions

Primary school students in Grades 1–6. Grades 1–3 get visual, picture-first solutions; Grades 4–6 get algebraic ones.

A parent or guardian signs up for the child — children don’t sign up by themselves. Choose “Sign Up”, enter your child’s name and grade, your own email and mobile number, and give your consent. After you confirm your email and our team approves the account, your child can sign in. If your child’s teacher or tutor uses Theorem, they can add your child instead: you’ll get an email to give your consent and choose the password.

Our team usually approves new accounts within 24 hours.

Families can start on our free plan. Paid plans are also available — you can see them on the Subscription page after signing up. If your child’s teacher or tutor added them, their plan comes with the teacher.

Solutions prepared with the help of AI are checked automatically before students see them — the answer and each calculation. Others are written by our team or by a teacher. If something still looks wrong, students can report it with the button next to the question, and we review every report.

Theorem covers the 5 olympiad exam areas: Logical Thinking, Arithmetic/Algebra, Number Theory, Geometry and Combinatorics — useful practice for TIMO, HKIMO, Big Bay Bei, PhIMO and similar competitions. Theorem is independent and not affiliated with the organisers of these competitions.

Yes — no ads, no chat, accounts approved by a parent and checked by our team, and data handled under the Data Privacy Act. See the Privacy Policy for the details.

Yes. Theorem works in any modern browser on a phone, tablet or computer, and can be added to the home screen like an app.

Yes — teachers and tutors get their own account to add students, write questions and worksheets, and follow each student’s progress. See the page for teachers and tutors.