Explore math vocabulary and concepts as well as mental math skills like addition, subtraction, comparing numbers, and place value skills with this set of 48 multi-step math riddles for odd and even numbers. Fun practice and review for second graders, you'll use these cards and activities for whole class number talks on your interactive board, math lesson warm-ups, math centers or math rotations, online lessons, early finishers, challenge work, enrichment, small groups, RTI, & tutoring,