In the US, 2,900,000 is the standard form. In Britain, standard form is a term for what people in the US call scientific notation, which would be 2.9 x 10^6 in this case.
.29
29 can be written as 2.90 × 101
0.725
The simplest form of 23 is 23 itself, and the simplest form of 29 is 29 itself.
The simplest form of 29/100 is 29/100.
Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, your example is written in standard form as: 0.029
.29
29 hundredths in standard form is 2.9 × 10-1
.29
29 billion thirty million in standard form is 2.003 × 1010
29 can be written as 2.90 × 101
29/100
64.029
29,032.000.00
512 in standard form is 5.12 × 102
29/8 is in its simplest form. It can also be written as 3 and 5/8.
-29/10