Convert these numbers between standard form and normal numbers

Question 1:

6.84× 10 5
684000

Question 2:

3.09× 10 6
3090000

Question 3:

2.48× 10 -4
0.000248

Question 4:

352000
3.52× 10 5

Question 5:

1740
1.74× 10 3

Question 6:

0.801
8.01× 10 -1