![](http://www.alamy.com/thumbs/6/6CF69D9A-D8ED-46CD-8429-F3830BEA527C/2T1RFE2.jpg)
Wooden counting rods used to calculate mathematics using colour and shape in early school books, friends of ten
Size: 4872px × 2128px
Photo credit: © Micha Klootwijk / Alamy / Afripics
License: Royalty Free
Model Released: No
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