16 Problem-Solving Stella Problems along with 16 Written Stella Solution Letters covering 4 math Standards: 4 problems in Numbers and Number Relationships, 4 problems in Geometry and Measurement, 4 problems in Probability and Statistics, and 4 problems in Patterns, Functions and Algebra. The document is saved as a word document so that the problems and solution letters can be easily modified and edited by teachers and tailored for their students.