John Posner
Member: 94 months
Authored: 1 videos
Description: Software technical writer in USA. Dabbler in math and computer education for younger kids. ...
BlockHead -- visual calculator for whole numbers [ID:201]
a series of video-tutorials by John Posner
BlockHead is a program that helps you find the answer to 3-digit addition and subtraction problems, by dragging-and-dropping blocks.
The first video in the series covers addition. The second video covers subtraction.