Build number sense, logical reasoning, and place value skills with these fun and interactive Mystery Number Riddles!Perfect for 1st and 2nd grade students, this set of no-prep activities gets learners thinking deeply about numbers using their hundreds chart as a tool. Each riddle includes 4–5 student-friendly clues that reinforce: Place value (tens and ones)Odd and even numbersSkip counting by 2s, 5s, and 10sComparing numbersBasic addition and subtractionStudents use the clues to eliminate possi