Is this realistically for 4-6 students, or would 4 kids work better with two containers of rods? Does age or math level make a difference?

I would get a much larger set for 4-6 students. I use this small group set for one child. I would recommend at least 3 sets for 4-6 children. As math level advances, having more 10 rods (the orange ones) is useful.

What is the modular size? i.e. what is the cubic size of the smallest piece - the 'one' unit. Is it 1x1x1 cm or larger?

The white cube is 1cm x 1cm x 1cm in this set. The wooden ones are preferable because the tiny extrusion nub on the plastic ones can make an increasing measurement error over the length of a model. I cannot recommend Cuisenaire rods more highly for their ability to make a colorful, tactile, and visual model for length, volume, and relative size. Metric measurement is the international standard and it allows children (and curious adults) the opportunity to understand both length and place value (powers of 10 for starters). American kids are left in confusion by two systems, one which is frankly antiquated and the other which is consistent and which interrelates length, mass, and volume. Metric should be the only system we teach if we want our students to achieve at high levels in math and science. Buy sets two to really use them flexibly. Also purchase one or two of the gray plastic Cuisenaire meter tracks and a wooden meter stick with mm markings. The tracks are fantastic for learning multiplication facts. On YouTube watch "Math at Your Fingertips" the Gattegno 1961 film of first graders using Cuisenaire rods to solve math problems well beyond expectations.

How many children can use this set at the same time?

Depends on what you’re doing. If you are homeschooling children of different ages you can most likely get by with 1 set. Otherwise I’d say 1 per child.

Manufacturer	Learning Resources
Brand	Learning Resources
Model number	LER7514
Product Dimensions	15.24 x 15.24 x 8.38 cm; 385.55 g
Color	Multi-color
Material Type	Wood
Number of Items	1
Size	S
Manufacturer Part Number	LER7514
Item Weight	386 g

Cuisenaire Rods Small Group Classroom Set, Math class, Teacher aids, 155 Piece Wood Set

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