please help

Function	Calculation	Amount	Formula	Formula	Work Area
ROUND	Round to closest dollar	209.78	210	=ROUND(C2,0)
ROUNDUP	Round up to next dollar	209.78	210	=ROUNDUP(C3,0)
ROUNDDOWN	Round down to next dollar	209.78	209	=ROUNDDOWN(C4,0)
ROUND	Round to nearest 100	1234	1200	=ROUND(C6,-2)
ROUNDUP	Round up to nearest 100	1234	1300	=ROUNDUP(C7,-2)
ROUNDDOWN	Round down to next dollar	1234	1200	=ROUNDDOWN(C8,-2)
ROUND	Round to nearest 1,000	1234	1000	=ROUND(C10,-3)
ROUNDUP	Round up to nearest 1,000	1234	2000	=ROUNDUP(C11,-3)
ROUNDDOWN	Round down to nearest 1,000	1234	1000	=ROUNDDOWN(C12,-3)