Significant Digits

What is the rule for multiplying with significant digits. You can find it at the following website.

Multiplication		The answer must be rounded off to 2 significant figures, since 1.6 only has 2 significant figures.
Division		The answer must be rounded off to 3 significant figures, since 45.2 has only 3 significant figures.

Multiply or divide the following numbers and round the answer to the proper number of significant digits.

1) 6.201 cm x 7.4 cm x 0.68 cm x 12.0 cm = ?

2) 1.6 m x 1.62 m x 1200 m = ?

3) 8.264 g / 7.8 g = ?

4) 10.4168 m / 6.0 m = ?

5) 12.00 m x 15.001 m = ?

6) 131 cm x 2.3 cm = ?

7) 5.7621 m x 6.201 m = ?

8) 20.2 s / 7.41 s = ?

9) 40.002 g / 13.000005 ml = ?

1568.6 x 1564 =

.0052365 x 125064 =

156700 / 26500 =

1050684.8 / 206540 =

1564.8056 x 26540 =

325 x 10054 =

.0056800 x 410 =

5600079.0 / 50.0 =