Final answer:
The number 2.5306 has five significant digits: 2, 5, 3, 0, and 6. The number 0.83 also has two significant digits: 8 and 3.
Step-by-step explanation:
The number 2.5306 has five significant digits: 2, 5, 3, 0, and 6.
The number 0.83 also has two significant digits: 8 and 3.