Adding Two-Digit Numbers Without Renaming · Autumn Term

Subtracting Two-Digit Numbers Without Renaming

Applying operations with rational numbers to solve complex, real-world problems, including those involving percentages.

Key Questions

  1. How do you subtract two-digit numbers by working with tens and units separately?
  2. What mental strategies can help you subtract numbers like 56 − 23 quickly?
  3. Can you set out a subtraction sum in columns and find the correct answer?

NCCA Curriculum Specifications

NCCA: Junior Cycle - Number - N.1.6NCCA: Junior Cycle - Problem Solving
Class/Year: 2nd Class
Subject: Mathematical Explorers: Building Foundations
Unit: Adding Two-Digit Numbers Without Renaming
Period: Autumn Term

Suggested Methodologies

Stations Rotation

Rotate through different activity stations

35–55 min

Learn more about Stations Rotation

Think-Pair-Share

Individual reflection, then partner discussion, then class share-out

10–20 min

Learn more about Think-Pair-Share

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Planning templates for Mathematical Explorers: Building Foundations

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5E Model

The 5E Model structures lessons through five phases (Engage, Explore, Explain, Elaborate, and Evaluate), guiding students from curiosity to deep understanding through inquiry-based learning.

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Math Unit

Plan a multi-week math unit with conceptual coherence: from building number sense and procedural fluency to applying skills in context and developing mathematical reasoning across a connected sequence of lessons.

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