251,000,000 in Scientific Notation = 2.51 x 108
251 million in Scientific Notation = 2.51 x 108
Note that 251 is the same as 251.0. Move 2 decimal places to the left to get: 2.51 x 102
2.51 million written in number form is 2,510,000
There are six of them.
As a number it is: 251,000,000
It is about 251 million years ago
251 million years ago
251 cm = 251 x 10 mm = 2,510 mm 561097 mm = 561097/1,000,000 km = 0.561097 km
The numeral 251770000 is usually indicated as 251,770,000 in the US. This is spelled out as "251 million, seven hundred and seventy thousand." The standard notation would be 2.5177 x 108.
Six million and sixty.
The Paleozoic Era lasted from 542 to 251 million years ago.
Pliosaurs lived from 251 to 65 million years ago