"Is it half full or half empty?"
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This month's new e-book is all about Capacity!

Ryan's Math Adventure: Capacity
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In order to solve the riddle of the Golden Star, our heroes travel through a portal to the Floa Forest but in up in the wrong place. After they lose their way in the forest, they end up at a dwarf village near Maozna. Sir Walter and the children help the town with their problems while they are there. Unfortunately, Sir Walter and the children are unable to solve the riddle of the Golden Star and return to Lord Ototo's castle.
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This book in the series introduces comparing volumes indirectly, understanding 1L, 1mL, units of volume, estimating and measuring volume, adding and subtracting volumes.
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Available for sale on Amazon: https://amzn.to/2llvYuY