Operators Blocks
 "Green Blocks" redirects here. For the teal blocks, see Pen Blocks.
Operators blocks is one of the ten categories of Scratch blocks. They are colorcoded lightgreen, and are used to script math equations and string handling. It was previously titled Numbers Blocks, but was renamed in Scratch 1.4 due to new blocks that handled strings.
There are currently 17 Operators blocks: 6 Boolean blocks and 11 Reporter blocks. This and PicoBoard Blocks are the only categories to contain no Stack blocks.
Blocks
Note:  Click on a block to learn more about it! 
Scratch 2.0 has the following 6 Operators Boolean Blocks:
Scratch 2.0 has the following 11 Operator Reporter blocks:
(() + ())
(()  ())
(() * ())
(() / ())
(pick random (1) to (10))
(join [hello] [world])
(letter (1) of [world])
(length of [world])
(() mod ())
(round ())
([sqrt v] of (9))
Obsolete Blocks
Prior to Scratch 1.2, the () of () block was two separate blocks, Abs () and Sqrt (), with no other mathematical functions.
Suggestions
Scratchers have suggested an Operators block that solves exponents.^{[1]}^{[2]}
(() ^ ():: operators)
Some Scratchers have suggested true and false Booleans, however this has not been implemented, possibly due to the easy workaround. ^{[3]}
References
 ↑ http://scratch.mit.edu/discuss/topic/9907
 ↑ https://scratch.mit.edu/discuss/topic/107714/
 ↑ https://scratch.mit.edu/discuss/topic/150228/?page=1
() + () • ()  () • () * () • () / () • Pick Random () to () • () < () • () = () • () > () • () and () • () or () • Not () • Join ()() • Letter () of () • Length of () • () Mod () • Round () • () of ()More blocks...

Main Block Categories 
Motion Blocks • Looks Blocks • Sound Blocks • Pen Blocks • Events Blocks • Control Blocks • Sensing Blocks • Operators Blocks • Data Blocks 
Other Block Categories 
More Blocks • LEGO WeDo Blocks • PicoBoard Blocks • Variables Blocks • Lists Blocks 