Open Middle®
Directions: Using the digits 1 to 9, at most one time each, place a digit in each box to make the equation true.
Hint
To evaluate an expression like log₂8, think 2 to what power equals 8?
Answer
There are multiple correct answers. Here are two examples:
log₂8 + log₃9 = 5
log₃9 + log₅1 = 2
log₂8 + log₃9 = 5
log₃9 + log₅1 = 2
Source: Dana Harrington