Number Sense:

• Number of the Day: Write a number on the board and have students come up with different ways to represent it (e.g., writing it in words, showing it on a place value chart, drawing it with dots).

• Choral Counting: Practice counting forwards, backwards, by skips. You can use a number line or counting objects.

• Mystery Number: Give clues about a number's place values (e.g., "The digit in the hundreds place is a 3") and have students guess the number.

Mental Math:

• Operations: Show addition or subtraction problems and have students answer mentally.

• Number Puzzles: Pose problems like "What number is 5 more than 12?" or "What is half of 18?"

Other Activities:

• Math Riddles: Present riddles that require students to use math concepts to solve (e.g., "I have four legs but cannot walk. What am I?" - a chair).

• Logic Puzzles: Simple brainteasers that get students thinking logically (e.g., "There are three apples on the table. If you take away two, how many do you have?").

• Place Value Games: Play games that involve manipulating numbers and understanding their place value (e.g., lining up students according to their birthdates).

These are just a few ideas, and you can adapt them to fit the specific needs of your students and the math topic you are covering. The key is to keep the warm-ups short, engaging, and relevant to the lesson.  Check out the links below for more ideas!