Free Grade 3 Introducing Matrix Addition Common Errors Worksheets
Free Grade 3 worksheets for Introducing Matrix Addition Common Errors: 12 real questions with a full answer key and worked solutions. A matrix is a grid of numbers. For a 2×2 matrix [[a, b], [c, d]], the determinant is ad − bc.
Free
Foundation
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing matrix addition common errors
Identify introducing matrix addition common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing matrix addition common errors
Explain introducing matrix addition common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing matrix addition common errors
Calculate introducing matrix addition common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing matrix addition common errors
Compare introducing matrix addition common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
Prerequisites
Close these gaps first — each has its own free lesson, worksheet and quiz.
How Introducing Matrix Addition Common Errors works
A matrix is a grid of numbers. For a 2×2 matrix [[a, b], [c, d]], the determinant is ad − bc.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.Find the determinant of [[-3, 3], [1, 6]].[1]
- 2.Find the determinant of [[2, 3], [3, -2]].[1]
- 3.Find the determinant of [[2, -4], [0, 4]].[1]
- 4.Find the determinant of [[5, 6], [1, 3]].[1]
- 5.Find the determinant of [[-3, 0], [4, 1]].[2]
- 6.Find the determinant of [[6, 1], [1, -2]].[2]
- 7.Find the determinant of [[-3, -2], [-4, 6]].[2]
- 8.Find the determinant of [[0, 6], [0, 0]].[2]
- 9.Find the determinant of [[-1, -2], [2, -2]].[3]
- 10.Find the determinant of [[2, 5], [3, 0]].[3]
- 11.Find the determinant of [[3, 6], [5, 6]].[3]
- 12.Find the determinant of [[4, 4], [-1, -4]].[3]
Show answers and working
1. -21
det = ad − bc. -3 × 6 − 3 × 1 = -21.
2. -13
det = ad − bc. 2 × -2 − 3 × 3 = -13.
3. 8
det = ad − bc. 2 × 4 − -4 × 0 = 8.
4. 9
det = ad − bc. 5 × 3 − 6 × 1 = 9.
5. -3
det = ad − bc. -3 × 1 − 0 × 4 = -3.
6. -13
det = ad − bc. 6 × -2 − 1 × 1 = -13.
7. -26
det = ad − bc. -3 × 6 − -2 × -4 = -26.
8. 0
det = ad − bc. 0 × 0 − 6 × 0 = 0.
9. 6
det = ad − bc. -1 × -2 − -2 × 2 = 6.
10. -15
det = ad − bc. 2 × 0 − 5 × 3 = -15.
11. -12
det = ad − bc. 3 × 6 − 6 × 5 = -12.
12. -12
det = ad − bc. 4 × -4 − 4 × -1 = -12.
Worked examples
Find the determinant of [[-2, 3], [6, -2]].
- det = ad − bc.
- -2 × -2 − 3 × 6 = -14.
- Answer: -14
Find the determinant of [[-2, -3], [3, 0]].
- det = ad − bc.
- -2 × 0 − -3 × 3 = 9.
- Answer: 9
Find the determinant of [[-3, 0], [0, -2]].
- det = ad − bc.
- -3 × -2 − 0 × 0 = 6.
- Answer: 6
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Calculates ab − cd.
Correction: Multiply the diagonals: ad − bc.
Gets signs wrong with negatives.
Correction: Bracket negatives before multiplying.
Teacher tips
- · Colour the two diagonals in different colours.
Parent tips
- · Point out spreadsheets as grids of numbers.
Real-life applications
- · Computer graphics, transformations.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
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- Yes. Every worksheets on FreeMathWorksheet is free to use, print and share — no account, no paywall and no watermark.
- What should a learner already know before this?
- Start with Introducing Matrix Addition Word Problems, Introducing Matrix Addition Techniques, Vectors. Each one has its own free lesson, worksheet and quiz.
- How is the worksheet sequenced?
- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
- What comes next after Introducing Matrix Addition Common Errors?
- Move on to Working with Matrix Addition, Matrix Addition in Context, which build directly on this idea.
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