(4 x 25 + 1) x 10
The Angstrom is a very small unit of linear measure. It so small that it is used in spectrometry to express the wavelength of light. It is 1 x 10-10 meters (or 10-10 m). That means that there are 1 x 1010 (or 1010) angstroms in just 1 meter. A kilometer (km) is 1000 meters, which is 103 meters, so there would be 1013 angstroms in a kilometer. (We add exponents: 1010 x 103 = 1010 + 3 = 1013.) As there are 1013 angstroms in a kilometer, there will be 10-13 kilometers in an angstrom. (We inverted to find that.) If you have 25 angstroms that you want to convert to kilometers, that's 25 x 10-13 kilometers in the 25 angstroms.
0.000000000751 = 7.51 x 10-10 Since you need to move the decimal point 10 places to the right, the exponent of 10 will be -10. What really you are doing is you are multiplying the given number by 1 represented as 1010/1010 : 0.000000000751 x 1010/1010, where 1/1010 = 10-10.
It will be 1010.
10/10 = 1
1, 2, 5, 10, 101, 202, 505, 1010.
The positive integer factors of 1010 are: 1, 2, 5, 10, 101, 202, 505, 1010
1010
The factors of 5050 are: 1, 2, 5, 10, 25, 50, 101, 202, 505, 1010, 2525, 5050.
1010 is 1 followed by 10 zeros = 10,000,000,000
5(1) = 55(2) = 1010(1) = 10
39 % of 25 is: 4 x (10% of 25) minus (1% of 25).
1010