Free Grade 3 Introducing Matrix Addition Essentials Flashcards
Free Grade 3 flashcards for Introducing Matrix Addition Essentials: 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
Core
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing matrix addition essentials
Identify introducing matrix addition essentials accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing matrix addition essentials
Explain introducing matrix addition essentials accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing matrix addition essentials
Calculate introducing matrix addition essentials accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing matrix addition essentials
Compare introducing matrix addition essentials 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 Essentials 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 [[4, 3], [0, 2]].[1]
- 2.Find the determinant of [[-1, -4], [5, 2]].[1]
- 3.Find the determinant of [[-3, -1], [3, -1]].[1]
- 4.Find the determinant of [[-4, -3], [-3, -4]].[1]
- 5.Find the determinant of [[-3, 3], [6, 6]].[2]
- 6.Find the determinant of [[-1, -4], [3, -2]].[2]
- 7.Find the determinant of [[0, 4], [1, 1]].[2]
- 8.Find the determinant of [[-2, 1], [1, -2]].[2]
- 9.Find the determinant of [[2, -2], [5, 6]].[3]
- 10.Find the determinant of [[-3, -3], [4, 6]].[3]
- 11.Find the determinant of [[-1, -4], [-1, 6]].[3]
- 12.Find the determinant of [[1, 4], [-1, -3]].[3]
Show answers and working
1. 8
det = ad − bc. 4 × 2 − 3 × 0 = 8.
2. 18
det = ad − bc. -1 × 2 − -4 × 5 = 18.
3. 6
det = ad − bc. -3 × -1 − -1 × 3 = 6.
4. 7
det = ad − bc. -4 × -4 − -3 × -3 = 7.
5. -36
det = ad − bc. -3 × 6 − 3 × 6 = -36.
6. 14
det = ad − bc. -1 × -2 − -4 × 3 = 14.
7. -4
det = ad − bc. 0 × 1 − 4 × 1 = -4.
8. 3
det = ad − bc. -2 × -2 − 1 × 1 = 3.
9. 22
det = ad − bc. 2 × 6 − -2 × 5 = 22.
10. -6
det = ad − bc. -3 × 6 − -3 × 4 = -6.
11. -10
det = ad − bc. -1 × 6 − -4 × -1 = -10.
12. 1
det = ad − bc. 1 × -3 − 4 × -1 = 1.
Worked examples
Find the determinant of [[-2, 0], [-3, -1]].
- det = ad − bc.
- -2 × -1 − 0 × -3 = 2.
- Answer: 2
Find the determinant of [[3, -2], [1, 0]].
- det = ad − bc.
- 3 × 0 − -2 × 1 = 2.
- Answer: 2
Find the determinant of [[1, 5], [6, -1]].
- det = ad − bc.
- 1 × -1 − 5 × 6 = -31.
- Answer: -31
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 flashcards 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 Vectors. Each one has its own free lesson, worksheet and quiz.
- How is the flashcards 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 Essentials?
- Move on to Introducing Matrix Addition Techniques, Introducing Matrix Addition Word Problems, Introducing Matrix Addition Common Errors, Working with Matrix Addition, which build directly on this idea.
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