how to roll half an attribute dice rounding down

I have a character sheet with an attribute defined of CASTER = 7 I want to make a macro that calls that CASTER attribute and rolls a number of dice equal to half that, rounding down. (@{CASTER}/2)d6 works, but it rounds up. So with CASTER =7, it returns 4d6 floor(@{CASTER}/2)d6 does not work. It takes CASTER =7, divides that by 2, rounds down, doesn't know what to do with that d6 after the ), so it returns 3 any way to do this?

Wrap the floor expression in inline roll brackets: [[floor(@{CASTER}/2)]]d6

Huzzah, that worked! I was not aware you could run multiple calculations of square brackets within square brackets. so [[1d6+[[floor(@{CASTER}/2)]]d6]] with CASTER = 7 properly calculates the 7/2 first (returning 3), then uses that 3 as the number of d6s to roll. And the macro returns 1d6+3d6 as intended.  Thank you.