How do you challenge someone in mathletics?

To challenge someone in Mathletics, you first need to log into your account and navigate to the "Challenges" or "Compete" section. From there, you can select the person you want to challenge and choose a specific math task or topic. You can customize the difficulty level and set a time limit if desired. Once you've set everything up, send the challenge, and the recipient will receive a notification to accept and compete against you.