Reflect a point
Reflect a point
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Reflect the point over the x-axis: (3, 2)
A' = ( , )
What does the generator do?
The generator picks a point with nonzero integer coordinates and one of three reflections (x-axis, y-axis, origin).
How to compute the image
Over the x-axis: x stays the same, y flips sign. Over the y-axis: y stays the same, x flips sign. Through the origin: both signs flip.
Other exercise generators:
- Absolute value and the opposite number
- Adding with Images
- Addition and Subtraction Exercises
- Addition within 100 — no regrouping
- Addition within 100 — with regrouping
- Addition & subtraction within 20
- Angle from a circle
- Classify the angle
- Classify an angle by its measure
- Measure an angle with a protractor
- Measure an angle with a protractor
- Angle sum in a quadrilateral
- Angle sum in a triangle
- Vertical and supplementary angles
- Area by counting squares
- Read a bar chart
- Bar charts (advanced)
- Building Blocks
- Classify the quadrilateral
- Classify a triangle by its angles
- Column addition — two-digit
- Column addition — 3 digits
- Column addition — 4-digit numbers
- Column subtraction — 3 digits
- Column subtraction — 4-digit numbers
- Compare the number of balls
- Compare two line graphs
- Compare integers
- Comparing Numbers
- Comparing within 100
- Compare numbers to 1,000
- Compare numbers up to 10,000
- Comparing within 20
- Compare large numbers
- Comparing Powers
- Complete the symmetric figure
- Perimeter and area of composite figures
- Cone Surface Area
- Cone Volume
- Count back through zero
- Counting Tens
- Counting tens
- Counting
- Cross Out
- Building from plan
- Cube buildings – mixed
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- Count visible cubes
- Cube net
- Surface area of a cube
- Building views
- Surface area of a cuboid
- Cuboid surface from net
- Volume by counting unit cubes
- Volume of a cuboid (formula)
- Volume of a cuboid with fractional edges
- Cylinder Surface Area
- Cylinder Volume
- Add and subtract decimals
- Compare decimals
- Divide a decimal by a decimal
- Divide a decimal by a whole number
- Decimals and fractions
- Multiply and divide decimals by 10, 100, 1000
- Multiply a decimal by a whole number
- Decimal on a number line
- Decimal place value
- Round decimals
- Decompose Powers into Product
- Digit at a given place
- Which digit is in the …?
- Distance between two points on a gridline
- Divide by 10, 100, 1000
- Long division
- Long division by a two-digit number
- Long division with remainder
- Divisibility rules
- Dividing by 2, 5, 10
- Division as sharing
- Fact families
- Reading dot plots
- Read a double bar graph
- Draw a polygon from coordinates
- Equation Solver
- Distributive property – equivalent expressions
- Evaluate an expression
- Evaluating expressions
- Expanded form
- Expanded form (up to 10,000)
- Expanded form (up to a million)
- Combining Like Terms
- Equivalent Expressions
- Evaluating Expressions
- Expanding Parentheses
- Factoring Out
- Algebraic Fractions
- Multiplying by a Monomial
- Cube of a Binomial
- Multiplying Binomials
- Substitution into Expressions
- All factors of a number
- Find the Correct Exercise
- Find the missing number to 1,000
- Find the Bigger or Smaller Number
- Fraction, decimal and percent — the same thing in three forms
- Divide a fraction by a fraction
- Name the fraction
- Fraction of a set
- Fraction of a set
- Write the fraction
- Shade the fraction
- Add fractions with different denominators
- Add fractions (same denominator)
- Compare fractions
- Equivalent fractions
- Multiply a fraction by a whole number
- Fraction of a number
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- Subtract fractions (same denominator)
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- Domain of a Function
- Inverse Proportion
- Linear Function
- Range of a Function
- Reading from Graph
- Function Table
- Dependent and Independent Variables
- Greatest common factor (GCF)
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- Find a number up to 100
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- Inequalities - Variable on Both Sides
- Inequalities - Intervals
- Inequalities - Mixed Problems
- Inequalities - Number Line
- Inequalities - Special Cases
- Inequalities with Fractions
- Inequalities with Parentheses
- Do we need brackets?
- Least common multiple (LCM)
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- Compare lengths
- Compare lengths in mixed units
- Compare lengths
- Convert from a larger unit to a smaller one
- Length: convert down
- Convert from a smaller unit to a larger one
- Length: convert up
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- Length: fill the missing unit
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- Imperial length: compare
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- Imperial length: convert down
- Imperial units – smaller to larger
- Imperial length: convert up
- Arithmetic with mixed units
- Convert two units to one
- Length units
- Length units — cm and m
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- Linear Equations - Basic
- Linear Equations - Both Sides
- Unknown in Denominator on Both Sides
- Unknown on Both Sides with Fractions
- Equivalent Equations
- Equations with Fractions - Unknown in Denominator
- Equations with Fractions - Unknown in Numerator
- Linear Equations - Number of Solutions
- Equations with Plus on One Side
- Equations with Two Plus Terms
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- Comparing measurements
- Median
- Mixed number ↔ improper fraction
- Mixed and improper fractions
- Mode
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- Combine coins
- Count the money
- Count money
- Euros and cents — decimal notation
- Making change
- Make change
- Money word problems
- Money word problems
- Multiples of a number
- Multiplication and Division Exercises
- Times tables 2, 5, 10
- Multiplication as an array
- Multiplication as an array — review
- Multiplication as addition
- Times tables — quick drill
- Find the missing factor
- Fill the missing times-table cell
- Times tables 1 to 12
- Multiplication word problems
- Times-tables word problems
- 2-digit × 2-digit multiplication
- Multiply and divide by 10, 100, 1000
- Column multiplication up to 10,000
- Multi-digit × 1-digit multiplication
- Long multiplication with multi-digit numbers
- Multiplying a round number by a one-digit number
- Multiplying a round number by the same digit
- Negative number on a number line
- Number Line
- Number Line up to 10
- Number on a 0–100 line
- Number line to 1,000
- Number Chain
- Addition Pyramid
- Number Series Completion
- One-step equations – add and subtract
- One-step equations – multiply and divide
- Order Numbers
- Order numbers to 100
- Order numbers to 1,000
- Order Numbers up to 10,000
- Order of operations — with brackets
- Find the right expression
- Order of operations — no brackets
- Multi-step problems — order of operations
- Parallel, perpendicular or intersecting?
- Area of a parallelogram
- Perimeter of a parallelogram
- Find the whole from a part and a percent
- Read the percentage from a 100-grid
- Percent of a whole number
- Percentage word problem
- Perimeter — square and rectangle
- Triangle perimeter
- Perimeter of a triangle
- Read a pictograph
- Reading pie charts
- Place of a digit
- What place is the digit in?
- Hundreds, tens and ones
- Tens and ones
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- Addition and Subtraction with Numbers Up to 10,000
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- Classify polygons
- Classify quadrilaterals
- Sides and vertices
- Direction and turns
- Powers
- Powers Calculation
- Powers and decimal places
- Powers Simplification
- Powers with Fractions
- Powers with Letters
- Powers with Unknown Exponent
- exercises.prima-01-length-units.title
- exercises.prima-02-painted-cubes.title
- exercises.prima-03-fraction-shaded.title
- exercises.prima-04-midpoint.title
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- exercises.prima-10-wire-shape.title
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- exercises.prima-12-dice-combinatorics.title
- exercises.prima-13-remainder-error.title
- exercises.prima-14-strike-out-digits.title
- exercises.prima-15-tallest-building.title
- exercises.prima-16-hidden-digits.title
- exercises.prima-17-number-line-mark.title
- exercises.prima-18-tickets.title
- exercises.prima-19-circles-row.title
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- Prime or composite?
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- Rule of three — direct proportion
- Pyramid Surface Area
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- Pythagorean Theorem – Find a Leg
- Pythagorean Theorem – Mixed Practice
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- Pythagorean Theorem – Word Problems
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- Range
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- Ratio in simplest form
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- Read Roman numerals
- Write Roman numerals
- Rounding large numbers
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- Round to the nearest 10 and 100
- Round 4-digit numbers
- Find the shapes
- Find the shape in the picture
- Name the shape
- Name the shape
- Name the shape
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- Triangle Similarity – Mixed Problems
- Triangle Similarity – Similarity Ratio
- Triangle Similarity – Similarity Theorems
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- Skip counting
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- Faces, edges, vertices
- Name the solid
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- Surface Area & Volume - Mixed
- Recognising solids – mixed
- Sphere Surface Area
- Sphere Volume
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- Perimeter of square and rectangle
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- Subtraction within 100 — with borrowing
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- Line of symmetry
- Lines of symmetry
- Read a tally chart
- Tally charts (advanced)
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- Tens and ones
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- Clock — whole hours (review)
- Hours and minutes conversion
- Time: convert units
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- Elapsed time
- Elapsed time problems
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- Perimeter of a trapezoid
- Area of triangle
- Perimeter of triangle
- Unit rate
- Converting units of volume
- Volume units — ml and l
- Capacity: convert millilitres and litres
- Weight units
- Weight units — g and kg
- Mass: convert grams and kilograms
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- Comparison word problems
- Word problems with decimals
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- Division word problems
- Word problems with fractions
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- Multiplication word problems
- Word problems — two steps
- Multi-step word problems
- Multi-step word problems
- Multi-step word problem
- Multi-step word problems
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- Number of trailing zeros