This problem pertains to Cuisenaire Rods:

Question

1-white
2-red
3-green
4-purple
5-yellow
6-dark green
7-black
8-brown
9-blue
10-orange

Question:

(a) If an all-brown train is equal in length to an all-orange train, what can be said about the number of brown rods compared to the number of orange rods?

(b) If a number can be represented by an all-red train, and an all-black train, it has at least eight factors. Name these factors.

(c) What is the smallest number of red rods for which an all-red train is equal in length to an all-blue train?

Answer 1

wow, haven't seen Cuisenaire Rods since the early 60's

Don't tell me they are still using these.