Si Prefixes

Front 1

Exa

Back 1

18

Front 2

Peta

Back 2

15

Front 3

Tera

Back 3

12

Front 4

Giga

Back 4

9

Front 5

Mega

Back 5

6

Front 6

Kilo

Back 6

3

Front 7

Hepto

Back 7

2

Front 8

Deka

Back 8

1

Front 9

Deci

Back 9

-1

Front 10

Centi

Back 10

-2

Front 11

Milli

Back 11

-3

Front 12

Micro

Back 12

-6

Front 13

Nano

Back 13

-9

Front 14

Pico

Back 14

-12

Front 15

Femto

Back 15

-15

Front 16

Atto

Back 16

-18

Front 17

Yocto

Back 17

-21

Front 18

Zepto

Back 18

-24