Teachers can use these flashcards as a whole class warm-up, as math stations, or in small groups. Students will practice adding, subtracting, multiplying, and dividing numbers by 10. Includes numbers 10-100 and more! Choose cards that meet your student levels. All students will benefit from this number sense activity. Instructions: The teacher holds up the number card and says the number aloud to the students. Then the teacher either points to the circles at the bottom of the cards to indic