BINARY NUMBER3rd GP Lesson

What is Binary?•Binary, used to describe a place-value number system, or a number belonging to it, that uses 2 rather than the more common decimal system that uses 10 as its base. Each digit in a binary number represents a power of 2 and so can only hold a 0 or a 1. The number 2 functions in binary the way 10 functions in decimal numbers.

•Since you can only count to 1 before needing another digit, binary numbers are longer to write out than decimal numbers. Most digital information, such as that stored on a computer’s hard drive, is in binary form.

128 64 32 16 8 4 2 1

100101 =

Binary Decimal

1 0 0 1 0 1

32 4+137

37

128 64 32 16 8 4 2 1

104 =

Decimal Binary

1

104 -64 40

40 -32 8

8 - 8 0

1 0 1 0 0 0

1101000

END OF THE LESSON