Ireland · NCCA Curriculum Specifications
3rd Class Mathematical Explorers: Building Number and Space
A comprehensive third class curriculum focusing on the transition from concrete to abstract mathematical thinking. Students develop fluency in multiplication, explore the properties of 2D and 3D shapes, and apply data handling skills to real world scenarios.

01The Power of Place Value and Operations
Students extend their understanding of the base ten system to 999 and develop flexible strategies for addition and subtraction.
Students will differentiate between natural numbers, integers, and rational numbers, understanding their properties and relationships.
Students will extend their understanding of place value to include decimal numbers, identifying the value of digits in tenths, hundredths, and thousandths.
Students will compare and order integers and rational numbers (including fractions and decimals) using number lines and appropriate symbols.
Students will develop strategies for adding and subtracting positive and negative integers, including using number lines and rules.
Students will perform addition and subtraction with decimal numbers, including those with different numbers of decimal places, in various contexts.
Applying addition and subtraction of integers, fractions, and decimals to solve multi-step real-world problems.
Students will round numbers to a specified number of decimal places and significant figures, understanding the implications for accuracy.
Students will use estimation strategies to approximate answers to calculations involving integers, fractions, and decimals, and to check the reasonableness of exact answers.
Students will apply the order of operations to evaluate numerical expressions involving integers, fractions, and decimals, including parentheses and exponents.

02Multiplication and Algebraic Thinking
Introducing multiplication as repeated addition and exploring patterns in the hundred square.
Students will understand and apply rules for multiplying and dividing positive and negative integers.
Students will perform multiplication and division with decimal numbers, including by powers of 10, and solve related problems.
Students will understand exponents as repeated multiplication and evaluate expressions involving positive integer exponents.
Students will identify prime and composite numbers, find factors and multiples, and determine the prime factorization of numbers.
Students will find the highest common factor (HCF) and lowest common multiple (LCM) of two or more numbers and apply them to problem-solving.
Students will understand variables, constants, and terms, and write simple algebraic expressions from verbal descriptions.
Students will substitute values for variables into algebraic expressions and evaluate them using the order of operations.
Students will understand the concept of an equation as a balance and an inequality as a comparison, and represent simple situations algebraically.

03Geometry and Spatial Reasoning
Investigating the properties of 2D shapes and 3D objects in the environment.
Students will classify polygons based on the number of sides and angles, with a focus on properties of different quadrilaterals (parallelograms, rectangles, squares, rhombuses, trapezoids).
Classifying polygons based on sides, angles, and symmetry.
Students will use rulers and other tools to draw and construct various 2D shapes.
Students will classify 3D shapes, focusing on prisms and pyramids, based on their bases and lateral faces.
Students will explore the relationship between the number of faces, edges, and vertices of polyhedra and apply Euler's formula (F + V - E = 2).
Students will use nets to calculate the surface area of prisms and pyramids.
Students will identify and classify angles (acute, obtuse, right, straight, reflex) and measure them using a protractor.
Students will apply the properties of angles on a straight line (sum to 180°) and angles around a point (sum to 360°) to solve problems.
Students will identify and describe rotational symmetry (order of rotation) and axial (line) symmetry in 2D shapes and patterns.

04Measurement in the Real World
Using standard units to measure length, weight, capacity, and time.
Students will convert between different units of length (mm, cm, m, km) and apply these conversions to real-world problems.
Students will calculate the perimeter of compound 2D shapes, including those with missing side lengths, and solve related problems.
Students will calculate the area of rectangles and triangles using appropriate formulas and apply these to problem-solving.
Students will understand the concept of time zones and calculate time differences between different locations around the world.
Students will understand the relationship between speed, distance, and time, and solve problems involving these quantities.
Students will calculate simple interest, understanding principal, rate, and time, and apply this to real-world financial scenarios.
Students will convert between different units of mass (mg, g, kg, tonnes) and apply these conversions to real-world problems.
Students will convert between different units of volume (cm³, m³) and capacity (ml, l) and understand their relationship.

05Data Handling and Probability
Collecting, representing, and interpreting data to answer questions and make predictions.
Students will differentiate between categorical and numerical data, and discrete and continuous data, and explore various methods of data collection (surveys, experiments, observation).
Students will organize and represent data using frequency tables, including grouped frequency, and construct stem-and-leaf plots.
Students will create and interpret bar charts for categorical data and histograms for continuous numerical data, understanding the differences.
Students will calculate and interpret the mean, median, and mode for a given set of data, understanding when each measure is most appropriate.
Students will calculate and interpret the range and interquartile range (IQR) to describe the spread or variability of a data set.
Students will understand and use the probability scale from 0 to 1, and use appropriate terminology (impossible, certain, likely, unlikely, even chance) to describe the likelihood of events.
Students will calculate the theoretical probability of simple events, expressing probabilities as fractions, decimals, and percentages.
Students will conduct simple probability experiments, record outcomes, and calculate experimental probability (relative frequency), comparing it to theoretical probability.