All of the digits are significant:
In 1000000 there is one significant figure.
1000000
1000000
7
2
In 1000000 there is one significant figure.
One significant figure.
1000000) has 1 significant figure and a least significant decimal of 6.
1000000
1000000
7
All digits are significant in this case. Any digit after a decimal point is a significant digit.
4 significant digits.
2
1000000
Three of them
There are four of them