not sure what you mean by 'thousands'
12,000 or 12/1000 or 1/12,000 (last would be thousandths most likely) probably the centre one
0.012
129,000
1.012
Twelve thousand, four hundred six.
12,000 = twelve thousands
12000
0.012
129,000
It is 712000.
1,200,000
Twelve ten thousands
1.012
712 000 or 712,000
1.2*10^4
Twelve thousand, four hundred six.
12,000 = twelve thousands
5.312 x 1000 = 5312