Greater than or less than?

Teacher selects a student to stand at front of room with back to board
Teacher writes a number between 0 - 20 on the board, ensuring class can see number but selected student cannot.

Students using physically active movements to describe if a number is 'greater than' or 'less than' a stated number.

Teacher writes number on the board and informs student the number is between 0 and 20.
Student, at front of the room, with back to the board, states a number.
Students respond by informing the student if the stated number is greater than or less than using physically active movements:
- Greater than - Star jumps
- Less than - Squats
Once number is successfully stated, teacher selects another student and writes a new number on the board.
Play continues following same steps above.
Teacher may choose to record numbers guessed on the board, as a follow-up task students place the numbers on an empty number line in ascending or descending order.