Problem: How many significant figures are in each of the following numbers?1.563300 1011

1. If your number has a decimal point move from: left to right

• Start counting once you get to your first non-zero number and keep counting until the end. 

2. If your number has NO decimal point move from right to left

• Start counting once you get to your first non-zero number keep counting until the end.

1.563300 x 10¹¹→ has decimal point →  trailing zeroes

• trailing zeros (zeroes after a non zero digit) after a decimal point → signficant