ancient calculator: crossword clues

Matching Answer
Confidence
ABACI
60%
ABACUS
41%
ENTER
20%
CLEAR
20%
LCD
20%
IONIA
20%
INCA
20%
SLIDERULE
20%
ADD
20%
SIN
20%
e.g. Greek Cheese
e.g. O?D (Use ? for unknown letters)