A highly detailed teacher guide and grading key for the Step Masters Check for Understanding. Includes step-by-step mathematical pathways, visual tape diagram models, student exemplar responses, and actionable diagnostic misconception analysis for every distractor.

A DOK 2/3 front-and-back student check for understanding on Arizona standard 3.NBT.A.2. Features 5 tiered question types, spacious mathematical workspaces, and an 'Explain-Your-Steps' kid-friendly rubric.

A comprehensive answer key and scoring exemplar for the Multi-Step Assessment, detailing standard mathematical solutions, correct multi-step operations, and proficient/highly-proficient writing exemplars.

A 2-page student-facing diagnostic assessment styled as an interactive 'Case File Audit'. Contains tiered tasks matching Arizona 3.NBT.A.2 PLD levels for multi-step addition, subtraction, and reasoning.

A comprehensive teacher rubric and instructional guide for multi-step word problems mapped to Arizona 3.NBT.A.2 PLDs, detailing performance levels, common student misconceptions, and targeted conferencing strategies.

A comprehensive teacher answer key and grading exemplar for the Estimate Detectives Assessment, featuring filled-in model answers, standard algorithms, and proficient-to-highly-proficient reasoning samples.

A highly engaging, 2-page student-facing diagnostic assessment styled as a 'Detective Case File'. Contains tiered tasks matching Arizona 3.NBT.A.2 PLD levels (Minimally to Highly Proficient) with clear handwriting spaces.

A comprehensive teacher rubric and instructional guide mapped to Arizona 3.NBT.A.2 PLDs, outlining student performance indicators, common misconceptions, and targeted coaching prompts for solution reasonableness through rounding.

A 2-page print-ready student worksheet with structured side-by-side workspaces for Base-Ten Drawings, Expanded Form, and Standard Algorithm across 4 scaffolded addition and subtraction problems (including regrouping across zero).

A 2-page visual exemplar document demonstrating mastery of 3-digit addition (378 + 245) and subtraction with regrouping across zero (602 - 247). Showcases Base-Ten Block Drawings, Expanded Form, and Standard Algorithm side-by-side with modeled student thinking.

A 2-page teacher reference document featuring a comprehensive proficiency rubric (Levels 1-4) for 3-digit addition and subtraction, along with concrete observational look-for's and prompt questions for the three core place value strategies.

A quick 4-question formative assessment to check place value mastery at the end of the lesson, designed as a final agency qualification test.

A targeted scaffolding and remediation sheet focusing on place value grid visualization, value breakdown, and building numbers with zeros.