The world is about to end !!! It took millions of years for humans to go from appearing to 1 billion people, but only 200 years to go from 1 billion to 8 billion. Human beings have been born for so long, Why did industrialization occur only in the past two hundred years ? !

Math Puzzles and Games, Grades 6-8 Over 300 Reproducible Puzzles that Teach Math and Problem Solving by Terry Stickels

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Math Puzzles and Games, Grades 6-8 Over 300 Reproducible Puzzles that Teach Math and Problem Solving by Terry Stickels
ISBN-13: 9780470227206
ISBN-10: 0470227206
Publisher : Jossey-Bass; 1st edition (September 15, 2009)
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