Hi, I'm Rex! Join me on 20 fossil-digging math missions, one for every big pre-algebra idea. I'll teach you the concept, show you a worked example, then it's your turn to dig up the answer.
20Missions
4Choices Each
100%Checked Math
How each mission works:
Read Rex's field note explaining the idea.
Check the "Remember" box and the worked example.
Solve the real mission question — pick A, B, C, or D.
Get instant feedback, then dig up the next specimen!