Place Value Cups. Use the cups to understand place value practice counting forward and backward learn the names of large numbers decompose numbers to expanded form. I would either label the cups 'ones' 'tens' etc. or add a comma cup or decimal point cup
FIRST GRADE - Telling Time- stick a hula hoop to the white board, and write numbers around the inside of the circle to make a "clock". You can make little notches around the inside of the hula hoop to practice telling time to the exact time.
Telling Time Lesson: A practicum student brought this activity in as a station during math game day and students LOVED it. It also greatly improved their comprehension of "half past" an hour telling time.