Crossword Clue:

ESTIMATE to calculate

AnswerCrossword Clue
TAXFigure often used to calculate a tip
AREAPi is often used to calculate it
AREAWhat an integral might be used to calculate
ENIAC1946 creation originally intended to calculate ballistics tables
TABLEFORTWOChart used to calculate a married couple's taxes?
AREAWhat an integral can be used to calculate
ENIACDevice originally made to calculate artillery firing tables