Is this enough as a class set for 20 students? Or how many would I have to order?!

Hello Amazon Customer! The Magnetic Algebra Tile set is a set of 8 printed magnetic sheets yields 72 pcs: Frame is printed and then the tiles are punched out: 20 Yellow unit tiles, 20 Red - unit tiles,12 Green x tiles,12 Red -x tiles, 4 Blue x2 (squared) tiles, 4 Red -x2 (squared) tiles. Feel free to contact us at review@learningresources.com with any other questions you may have.

Are they double sided? positive/negative on each side?

I have purchased many sets of algebra tiles. This set is not double sided but on thin magnetic sheets- perfect for a small group or individual student work. They have lasted quite awhile with a lot of student work. There are much larger two sided sets available that are also magnetic.

ASIN	B003H5EQLY
Best Sellers Rank	#32,117 in Office Products ( See Top 100 in Office Products ) #257 in Early Childhood Education Materials
Brand	Learning Resources
Color	Multi Color
Department	Bedroom
Global Trade Identification Number	00765023076417
Is Discontinued By Manufacturer	No
Item Weight	1 pounds
Item model number	LER7641
Manufacturer	Learning Resources
Manufacturer recommended age	5 - 10 years
Material	Plastic
Number of Pieces	120
Product Dimensions	11.3 x 6.5 x 0.3 inches
Release date	January 1, 2010
Shape	Rectangular, Square
Size	Large
UPC	885606014084 765023076417
Unit Count	1.0 Count

Learning Resources Magnetic Algebra Tiles, Algebraic Math Skills, Magnets for Any Magnetic Surface, 72 Piece Set, Ages 11+

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