Final answer:
To split 22.5 into 9 equal groups, divide 22.5 by 9. Each group will have an equal share of 2.5 units.
Step-by-step explanation:
To split 22.5 into 9 equal groups, we divide 22.5 by 9. Each group will have an equal share of 2.5 units. So, 22.5 split into 9 equal groups is 2.5.