Mental Maths: Quick Adding and Subtracting
Develop a repertoire of mental strategies for addition and subtraction of larger numbers, decimals, and simple fractions.
Key Questions
- How can you add small numbers quickly in your head?
- What trick can you use when adding any number to 10?
- Can you use doubles, like 4 + 4, to help you work out 4 + 5?
NCCA Curriculum Specifications
Suggested Methodologies
Ready to teach this topic?
Generate a complete, classroom-ready active learning mission in seconds.
Planning templates for Foundations of Mathematical Thinking
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.
unit plannerMath 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.
rubricMath Rubric
Build a math rubric that assesses problem-solving, mathematical reasoning, and communication alongside procedural accuracy, giving students feedback on how they think, not just whether they got the right answer.
More in Addition of Numbers to 20
Addition of Integers and Rational Numbers
Explore addition of positive and negative integers, fractions, and decimals, using various models and strategies.
2 methodologies
Subtraction of Numbers to 20
Investigate subtraction of positive and negative integers, fractions, and decimals, using various methods and understanding 'subtracting a negative'.
2 methodologies
Addition and Subtraction as Opposites
Understand the inverse relationship between operations to solve linear algebraic equations involving one variable.
2 methodologies
Counting in Equal Groups
Practice mental multiplication and division using strategies like doubling and halving, factorisation, and estimation for larger numbers and decimals.
2 methodologies
Sharing Objects Equally
Understand multiplication of integers, fractions, and decimals, including the rules for signs and multiplying by powers of ten.
2 methodologies