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National Museum of Mathematics on Twitter: "In the set of numbers below, 72 and 99 are “combined” to produce 27. Then 27 and 45 are “combined” to produce 18 and so on.
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Amazon.com: Aizweb Multiplication Chart Puzzle,21" x 21" Multiplication Game Table for Kids Ages 7+, Math Game Math Manipulatives Learning Educational Toy - 1st,2nd,3rd,4th,5th and 6th Grade Class or Homeschool : Toys &
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If 2+3=8, 3+7=27, 4+5=32, 5+8=60, and 6+7=72, how would one solve 7+8=? - YouTube
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Untangle - House of Puzzles & Board Games on Twitter: "Solution for today's Misleading Puzzle. If you liked solving this one, do RT the previous tweet. See you again with the next
Legendary Nob Yoshigahara's mathematical puzzle: Here is how to solve it