Convert these numbers between standard form and normal numbers

Question 1:

5.13× 10 6
5130000

Question 2:

1.92× 10 4
19200

Question 3:

7.14× 10 -1
0.714

Question 4:

3390000
3.39× 10 6

Question 5:

4260000
4.26× 10 6

Question 6:

0.000824
8.24× 10 -4