You are trying to achieve the goal number. You may only use two-term equations with the numbers 1-9 and results of previous equations. The only operators you can use are addition, subtraction, multiplication, and division.
Good Examples: 2×5=10 10+9=19 Bad Examples: 20+14=34: This equation uses two-digit numbers not results of previous equations 2^5=32: This equation uses a non-allowed operator