Perhaps the greatest obstacle to succeeding in fourth-grade geometry is the vocabulary. We practice hand motions and chants every day to memorize the difference between a line and a line segment, perpendicular and parallel, etc. We also have a song to help us remember the prefixes of shapes names.
Shape Song
(to the tune of “Three Blind Mice”)
Hold up fingers as you sing.
Tri, quad, penta.
Tri, quad, penta.
Hexa, hepta, octa, nona,
Decagon!