Fixed blocks of your post
Does your post mean these blocks?
You can learn how to use the [snapblocks] tag in the snapblocks documentation.
[snapblocks] of the fixed blocks
[snapblocks]
set [ex V] to (pick random (1) to (10))
set [ex2 V] to (pick random (1) to (10))
set [answer1 V] to ((ex) + (ex2) @<:>)
[/snapblocks]