Numbers that Add to 7, Circles, Ellipses, Reading 6:00 on a Clock, 5 + ? = 7, Days of the Week, Leap Years, Spelling February, Dressing for Cold Weather, 15 Degrees Below Zero (–15º), Deciduous Trees, Deciduous Teeth, Counting by Fives, 3x + 4x = 7x, Archimedes 287 B.C. Wrote The Sand Reckoner and Got Killed Being Rude, ante meridiem (a.m.), Donner and Blitz in German, One Million, Euclid Wrote The Elements, Squares, Pacific and Atlantic Oceans, Whales Are Not Fish, The “There Are Zero . . .” Game, Sets, the Popularity of Zero, Why Boats Are Cheaper to Rent in the Winter, Triangles, Herbivores and Carnivores, the Colors of the Rainbow, a King in Checkmate, the Story of the Titanic, ≠ (not equal), x + 4 = 7, One Thousand, Counting by Hundreds, Reading 3:05 on a Clock, Rectangles.