What Is The Number?

Riddles like this are excellent tools for developing critical thinking and number sense, especially for students learning the fundamentals of place value in mathematics. In this riddle, the key is understanding the relationship between the digits: the tens digit is twice the ones digit, and the number lies between 70 and 90. To solve it, first note the possible tens digits between 7 and 8 (since 70 to 90): 7 or 8. The tens digit is twice the ones digit, so if the tens digit is 7, the ones digit must be 3.5, which is not a digit, so 7 is excluded. If tens digit is 8, the ones digit must be 4 (since 8 is twice 4). Thus, the number is 84. This riddle helps reinforce understanding of digit values and constraints in number formation. Personally, using puzzles like this in learning sessions has made math more engaging, helping learners build confidence while having fun. Try creating similar riddles yourself or challenge friends with variations involving different digit relationships or number ranges for an interactive math learning experience.