Answer:

misadd

Answer	Crossword Clue
MISADD	Total wrong
MISADD	Get a wrong number
MISADD	Get a wrong total

MISADD	Reach a wrong number, perhaps
MISADD	Do sum thing wrong?
MISADD	Total badly
MISADD	Mess up the math
MISADD	Have sum trouble
MISADD	Total incorrectly
MISADD	Total up incorrectly
MISADD	Err on a check, maybe

MISADD	Be a total failure?
MISADD	Totally screw up?

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.