Warm up for math with repeated addition! Use the mice pictures from this recent post and get a dice and 12 counters.
Your students will be:
- making equal groups of 2
 - practicing repeated addition
 - finding the total of equal groups
 - beginning to explore skip counting
 

Students roll a dice and gather a matching number of mice.
They then add 2 counters to each (as ears) and find the total.
Encourage them to describe their action - 2 mice with 2 ears makes 4 ears altogether. This is important. Make it verbal - as a warm up you want as much play as possible and recording on paper can come later in your main lesson.

3 mice with 2 ears makes 6 ears altogether. 1, 2, 3, 4, 5, 6. To begin to skip count have them say the second number a little louder on each count. 
I hope you have fun with math today!