Number roots from Greek and Latin show up everywhere once you know them, and this challenge puts mono, bi, tri, and poly to work in trickier words. Multiple choice asks what monologue means, what a bilingual person has two of, why a triangle fits its name, and what body signals a polygraph records to detect lies.

Fill-ins stretch into monopoly, binoculars, triathlon, tripod, and polyphonic music with many notes at once. Working through these proves you can break a long word into number-clues plus a second root, which is the real key to decoding unfamiliar vocabulary in science and social studies.