Focus: Reasoning about Number Relationships -- Carina's Pet Shop -- Focus: Reasoning about Algebraic Relationships -- Making and Breaking Solids -- Focus: Reasoning about Geometric Relationships -- Comparing Ourselves with Others -- Focus: Reasoning about Measurement Relationships -- Which Month to Ski? -- Focus: Reasoning about Data Relationships -- LOOKING BACK AND LOOKING AHEAD -- Blackline Masters and Solutions --Can You Divide It Evenly? -- How Do You Know It's Divisible? -- A PIN for Mr. Mitchell -- Carina's Pet Sales -- Projecting from Patterns -- Centimeter Grid Paper -- Animal Accounting -- Cutting and Making Solids --Geoblock Comparisons -- Cutting a Rectangular Prism into Congruent Pieces -- Cross Sections of a Cube -- Measuring Up with Animals -- Inch Grid Paper -- A Snail's Pace -- Time to Walk vs. Time to Jog -- Faster than a Speeding Ostrich? -- Walking and Jogging to School -- Is There a Giant in the House? -- Skiing for the First Time? -- What Do You Know about It Now? -- Which Month to Ski? -- Another Year of Snow.