Math Warm Ups Addition & Subtraction are perfect to develop number sense & math talk. Use one Math Warm Up each day or several in a day for a longer lesson. ALIKE & DIFFERENT -- 1st and 2nd Grade -- JANUARY pack -- 25 slides for the month!What is a Number Sense Math Warm Up? This is a routine that can be used to develop your students number sense. It can be used as a warm up, or really at any other time during your class. Use it in morning meeting, as an exit ticket, a conversatio