List 1: addend, data, difference, equation, estimate, subtrahend, calendar, communicate, Earth, air, atmosphere, chore, Monday, Tuesday, this, people, went. (September 17)

List 2: subtract, minus, difference, from, weather, climate, migration, nomad, there, their, your, number line, hypothesis, estimate, continent (September 24)

List 3: herbivore, omnivore, carnivore, erosion, evaporation, heritage, territory, boundary, longitude, latitude, vowel, consonant, symbol,map, story (October 1)

List 4: base-ten, number family, numeral, decimal, property (math term), gravity, friction, mixture, pressure, equator, location, region, landmark, barter, trade   (October 8)

List 5: acute, attribute, equiangular, equilateral, inequality, obtuse, time, culture, century, ancestor, adapt, state, ecosystem, photosynthesis, hydrosphere (October 22; no new words October 15)