Unit Plan 18 (Grade 2 Math): Midyear Synthesis—OA + NBT + MD
Blend word problems, place-value computation, time and money skills, and data displays; choose representations, justify strategies, and check reasonableness using units and place-value thinking.
Focus: Blend word problems, place-value computations, time/money, and data displays; emphasize explanations, representations, and reasonableness.
Grade Level: 2
Subject Area: Mathematics (Operations & Algebraic Thinking • Number & Base Ten • Measurement & Data • Math Practices)
Total Unit Duration: 5 sessions (one week), 35–45 minutes per session
I. Introduction
Students rotate through mixed problem sets that interleave one- and two-step word problems, addition/subtraction within 100/1,000, time to five minutes, money situations, and graphs/line plots. They practice choosing representations (drawings, number lines, tables, graphs), checking reasonableness, and explaining their choices using precise units and place-value language.
Essential Questions
- How do I choose a good strategy and representation for a mixed problem set?
- How do place value and units help me explain and check my answers?
- How can I show that my solution is reasonable using estimates and models?
II. Objectives and Standards
Learning Objectives — Students will be able to:
- Model and solve one- and two-step problems with unknowns in all positions using drawings, equations, and words.
- Compute accurately using place-value strategies: add/subtract within 100 and 1,000, add several two-digit numbers, and mentally add/subtract 10 or 100.
- Tell/write time to the nearest five minutes and solve simple elapsed-time situations; count money and solve dollar/cent problems.
- Create and interpret picture/bar graphs and line plots; answer how many more/fewer and total/difference questions.
- Explain and justify methods; estimate to check reasonableness and use correct units.
Standards Alignment — CCSS Grade 2 (spiral across the unit)
- 2.OA.1–4: One- and two-step word problems; fluency within 20 strategies; even/odd reasoning; arrays as repeated addition.
- 2.NBT.2–9: Skip-counting, read/write/compare numbers to 1,000; add/sub within 100/1,000; add several two-digit numbers; mental tens/hundreds; explain strategies.
- 2.MD.5–10: Length problems on number lines, time to five minutes, money problems, line plots, picture/bar graphs and interpretation.
- Mathematical Practices (MP.1–MP.6): Perseverance, reasoning, argument, modeling, tools, precision.
Success Criteria — Student Language
- I can choose a strategy (drawings, number line, base-ten sketch, table/graph) and explain why.
- I can show my work with units and place-value steps, then estimate to check.
- I can defend my answer using a model, an equation, and a sentence.