Numdrum
The Numdrum was invented by John Harrison to help a child struggling with the basics of understanding numbers, adding and subtraction. It is a simple but revolutionary development.
The Numdrum consists of a number line from 0 to 139, wound round a tube, forming a helix. There are ten numbers per turn of the helix, which measures 100 mm by 36 mm, a convenient size for a child's hand.The resulting arrangement is somewhat similar to a hundred square, in that vertical movement is in jumps of 10, horizontal movement in units.
Unlike the hundred square, the Numdrum overcomes the 3 major problems outlined and introduces many Cross-Curricular interesting posibilities, including an introduction to Algebra, and solving simultaneous equations.
Donated by Primarily Numbers - giant drum, large drum, standard, decimal and negative mid sized numdrums with sleeves and four pupil size numdrums with sleeves.
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