Ontario Grade 3 math curriculum
The Grade 3 math outcomes we teach, in the curriculum's own words, with the lessons and practice pages for each. Pick an outcome code for the full list of lessons and printables.
Ontario Mathematics, Grades 1–8. Every lesson comes with a printable teacher guide and student sheet.
Number
B1.6 Use drawings to represent, solve and compare the results of fair-share problems, with answers that are whole numbers, mixed numbers or fractions.
Lessons: Fair Shares: Fractions and Decimals (Is half always the same size?)
Practice: Fair Shares: Fractions and Decimals workbook · Grade 3 Ontario Math: Number · Grade 4 Ontario Math: Number
B1.7 Represent and solve fair-share problems about equivalent fractions: halves, fourths and eighths; thirds and sixths.
Lessons: Fair Shares: Fractions and Decimals (Is half always the same size?, Where does three-quarters stand?) (partly)
Practice: Fair Shares: Fractions and Decimals workbook · Grade 3 Ontario Math: Number
B2.8 Show that the numerator of a fraction counts unit fractions, for example 3/5 is 1/5 + 1/5 + 1/5, using tools, drawings and standard fractional notation.
Lessons: Fair Shares: Fractions and Decimals (Which recipe makes more?)
Practice: Fair Shares: Fractions and Decimals workbook · Grade 3 Ontario Math: Number · Grade 4 Ontario Math: Number
Data
D1.3 Display sets of data, using many-to-one correspondence , in pictographs and bar graphs with proper sources, titles, and labels, and appropriate scales. (line plots and bar graphs of class data; partial).
Lessons: Measure It: Length, Time and Mass in the Real World
Practice: Grade 3 Ontario Math: Data · Grade 4 Ontario Math: Data
Spatial Sense
E2.1 Use appropriate units of length to estimate, measure and compare the perimeters of polygons, and construct polygons with a given perimeter.
Lessons: Fence It, Fill It: Area and Perimeter (Does the same fence always hold the same garden?, How much turf for an L-shaped playground?)
Practice: Fence It, Fill It: Area and Perimeter workbook · Grade 3 Ontario Math: Spatial Sense · Grade 5 Ontario Math: Spatial Sense
E2.2 Explain the relationships between millimetres, centimetres, metres, and kilometres as metric units of length, and use benchmarks for these units to estimate lengths.
Lessons: Measure It: Length, Time and Mass in the Real World
Practice: Grade 3 Ontario Math: Spatial Sense
E2.4 Compare, estimate, and measure the mass of various objects, using a pan balance and non-standard units. (coat-hanger balance).
Lessons: Measure It: Length, Time and Mass in the Real World
E2.5 Use various units of different sizes to measure the same attribute of a given item, and demonstrate that even though using different-sized units produces a different count, the size of the attribute remains the same. (feet versus metre sticks).
Lessons: Measure It: Length, Time and Mass in the Real World
Practice: Measure It: Length, Time and Mass in the Real World workbook · Grade 3 Ontario Math: Spatial Sense
E2.6 Use analog and digital clocks and timers to tell time in hours, minutes, and seconds. (minute estimates).
Lessons: Measure It: Length, Time and Mass in the Real World
Practice: Measure It: Length, Time and Mass in the Real World workbook · Grade 3 Ontario Math: Spatial Sense · Grade 4 Ontario Math: Spatial Sense · Grade 4 Time and Measurement Problems
E2.8 Use appropriate non-standard units to measure area, and explain how gaps and overlaps affect accuracy (sticky-note tiles).
Lessons: Fence It, Fill It: Area and Perimeter (Which mat is the biggest?)
Practice: Fence It, Fill It: Area and Perimeter workbook · Grade 3 Ontario Math: Spatial Sense
E2.9 Use square centimetres (cm²) and square metres (m²) to estimate, measure and compare the areas of two-dimensional shapes.
Lessons: Fence It, Fill It: Area and Perimeter (Which mat is the biggest?, Does the same fence always hold the same garden?) (partly)
Practice: Fence It, Fill It: Area and Perimeter workbook · Grade 3 Ontario Math: Spatial Sense
More outcomes
B1.1 Read, represent, compose and decompose whole numbers up to and including 1000, using a variety of tools and strategies, and describe ways they are used in everyday life.
Practice: Grade 3 Ontario Math: Number
B1.2 Compare and order whole numbers up to and including 1000, in various contexts.
Practice: Grade 3 Ontario Math: Number
B1.3 Round whole numbers to the nearest ten or hundred, in various contexts.
Practice: Grade 3 Ontario Math: Number
B1.4 Count to 1000, including by 50s, 100s and 200s, using a variety of tools and strategies.
Practice: Grade 3 Ontario Math: Number
B1.5 Use place value to describe and represent multi-digit numbers in a variety of ways, including with base ten materials.
Practice: Grade 3 Ontario Math: Number
B2.1 Use the properties of operations, and the relationship between multiplication and division, to solve problems and check calculations.
Practice: Grade 3 Ontario Math: Algebra · Grade 3 Ontario Math: Number · Grade 3 Word Problems: 100 Canadian Situations
B2.2 Recall and demonstrate the multiplication facts of 2, 5 and 10, and the related division facts.
Practice: Grade 3 Ontario Math: Number · Grade 4 Ontario Math: Number · Grade 5 Ontario Math: Number
B2.3 Use mental math strategies, including estimation, to add and subtract whole numbers that add up to no more than 1000, and explain the strategies used.
Practice: Grade 3 Ontario Math: Number · Grade 3 Word Problems: 100 Canadian Situations
B2.4 Show how the algorithms for adding and subtracting whole numbers work, by connecting them to base ten materials and other tools and strategies.
Practice: Grade 3 Ontario Math: Number · Grade 3 Word Problems: 100 Canadian Situations
B2.5 Represent and solve addition and subtraction problems with whole numbers that add up to no more than 1000, using tools and algorithms.
Practice: Grade 3 Ontario Math: Number · Grade 3 Word Problems: 100 Canadian Situations
B2.6 Represent multiplication up to 10 × 10 and division up to 100 ÷ 10, using tools and drawings, including arrays.
Practice: Grade 3 Ontario Math: Number · Grade 3 Word Problems: 100 Canadian Situations
B2.7 Represent and solve multiplication and division problems, including problems with groups of one half, one fourth and one third, using tools and drawings.
Practice: Grade 3 Ontario Math: Number · Grade 3 Word Problems: 100 Canadian Situations
C1.1 Identify and describe repeating elements and operations in a variety of patterns, including patterns found in real-life contexts.
Practice: Grade 3 Ontario Math: Algebra
C1.2 Create and translate patterns that have repeating elements, movements or operations, using shapes, numbers and tables of values.
Practice: Grade 3 Ontario Math: Algebra
C1.3 Determine pattern rules and use them to extend patterns, make and justify predictions, and identify missing elements in patterns with repeating elements, movements or operations.
Practice: Grade 3 Ontario Math: Algebra
C1.4 Create and describe patterns to show relationships among whole numbers up to 1000.
Practice: Grade 3 Ontario Math: Algebra
C2.1 Describe how variables are used, and use them in various contexts.
Practice: Grade 3 Ontario Math: Algebra · Grade 4 Ontario Math: Algebra
C2.2 Determine whether given sets of addition, subtraction, multiplication and division expressions are equivalent or not.
Practice: Grade 3 Ontario Math: Algebra · Grade 3 Ontario Math: Number · Grade 3 Word Problems: 100 Canadian Situations
C2.3 Identify and use equivalent relationships for whole numbers up to 1000, in various contexts.
Practice: Grade 3 Ontario Math: Algebra · Grade 4 Ontario Math: Algebra
D1.2 Collect qualitative and quantitative data through observations, experiments and interviews to answer questions of interest, and organize the data in frequency tables.
Practice: Grade 3 Ontario Math: Data · Grade 4 Ontario Math: Data
D1.4 Find the mean and identify the mode or modes, if any, of data sets of whole numbers, and explain what each measure tells about the data.
Practice: Data Detectives workbook · Mean, Median, Mode and Range · Grade 3 Ontario Math: Data · Grade 4 Ontario Math: Data · Grade 5 Ontario Math: Data
D1.5 Analyse data shown in different ways, including frequency tables and graphs with different scales, by asking and answering questions, drawing conclusions, and making convincing arguments and informed decisions.
Practice: Grade 3 Ontario Math: Data · Grade 4 Ontario Math: Data
D2.1 Use the terms impossible, unlikely, equally likely, likely and certain to describe how likely events are, and use that likelihood to make predictions and informed decisions.
Practice: Grade 3 Ontario Math: Data · Grade 4 Ontario Math: Data · Grade 5 Ontario Math: Data
E1.1 Sort, build and identify cubes, prisms, pyramids, cylinders and cones by comparing their faces, edges, vertices and angles.
Practice: Grade 3 Ontario Math: Spatial Sense
E1.2 Put structures together and take them apart, and name the 2D shapes and 3D objects they are made of.
Practice: Grade 3 Ontario Math: Spatial Sense
E2.7 Compare the areas of 2D shapes by matching, covering, or cutting apart and rearranging them, and show that different shapes can have the same area.
Practice: Fence It, Fill It: Area and Perimeter workbook · Grade 3 Ontario Math: Spatial Sense
F1.1 Estimate and calculate the change needed for simple cash transactions, using whole-dollar amounts and amounts of less than one dollar.
Practice: Canadian Money: Counting Coins and Bills · Grade 3 Ontario Math: Financial Literacy
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