{"type":"rich","version":"1.0","title":"Missing Number Mysteries","description":"Players solve subtraction facts by choosing the missing addend that completes a related addition equation, such as 9 - 6 = ? and 6 + ? = 9. This helps students see subtraction as finding the number needed to make the whole. (1.OA.B.4)","author_name":"Padlet Arcade","thumbnail_url":"https://arcade.padlet.com/open-graph/social-preview-image.png?timestamp=1774333784588&hashid=3yjN54JJr4","html":"<iframe src=\"https://arcade.padlet.com/embed/3yjN54JJr4\" width=\"720\" height=\"480\" frameborder=\"0\" allowfullscreen></iframe>","width":720,"height":480,"provider_name":"Padlet Arcade","provider_url":"https://arcade.padlet.com"}