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Showing posts with label mental calculation. Show all posts
Showing posts with label mental calculation. Show all posts

Sunday, March 21, 2021

Mental Calculation

 














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Labels: estimation, mental calculation, problem, puzzle

Thursday, December 31, 2020

Equation to Solve in Your Head!








 (from Boris Kordemsky - The Moscow Puzzles)

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Labels: algebra, mental calculation, problem, simultaneous equations

A mental volume problem


 











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Labels: mental calculation, problem
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