**Problem : **
How many significant digits does 5,273 have?

**Problem : **
How many significant digits does 70,265 have?

**Problem : **
How many significant digits does 60,286,000 have?

**Problem : **
How many significant digits does 56.100 have?

**Problem : **
How many significant digits does 40.0 have?

**Problem : **
How many significant digits does 40 have?

**Problem : **
If we know 3 digits of a measurement precisely, how many digits should we write
down
when we record the measurement? How many significant digits will our
measurement
have?