![](http://www.alamy.com/thumbs/6/57F93F3E-E8D1-42A5-90A1-DB2DBBA8FACE/2T0TCHM.jpg)
Wooden counting rods used to calculate mathematics using colour and shape in early school books, friends of ten
Size: 5776px × 3792px
Photo credit: © Micha Klootwijk / Alamy / Afripics
License: Royalty Free
Model Released: No
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