Free Grade 3 Introducing Equations with Unknowns Both Sides Common Errors Flashcards
Free Grade 3 flashcards for Introducing Equations with Unknowns Both Sides Common Errors: 12 real questions with a full answer key and worked solutions. An equation is a balance. Do the same thing to both sides until the letter is on its own, then check by substituting back.
Free
Core
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing equations with unknowns both sides common errors
Identify introducing equations with unknowns both sides common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing equations with unknowns both sides common errors
Explain introducing equations with unknowns both sides common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing equations with unknowns both sides common errors
Calculate introducing equations with unknowns both sides common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing equations with unknowns both sides common errors
Compare introducing equations with unknowns both sides 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 Equations with Unknowns Both Sides Common Errors works
An equation is a balance. Do the same thing to both sides until the letter is on its own, then check by substituting back.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.Solve x + 18 = 27.[1]
- 2.Solve x + 16 = 28.[1]
- 3.Solve x + 9 = 13.[1]
- 4.Solve x + 11 = 19.[1]
- 5.Solve 9x + 5 = 86.[2]
- 6.Solve 9x + 11 = 65.[2]
- 7.Solve 5x + 2 = 2.[2]
- 8.Solve 8x + 16 = 72.[2]
- 9.Solve 2x + 9 = 1x + 21.[3]
- 10.Solve 9x + 16 = 3x + 64.[3]
- 11.Solve 2x + 15 = 1x + 5.[3]
- 12.Solve 3x + 9 = 1x + 3.[3]
Show answers and working
1. x = 9
Subtract 18 from both sides: x = 9. Check: 1 × 9 + 18 = 27.
2. x = 12
Subtract 16 from both sides: x = 12. Check: 1 × 12 + 16 = 28.
3. x = 4
Subtract 9 from both sides: x = 4. Check: 1 × 4 + 9 = 13.
4. x = 8
Subtract 11 from both sides: x = 8. Check: 1 × 8 + 11 = 19.
5. x = 9
Subtract 5 from both sides: 9x = 81. Divide by 9: x = 9. Check: 9 × 9 + 5 = 86.
6. x = 6
Subtract 11 from both sides: 9x = 54. Divide by 9: x = 6. Check: 9 × 6 + 11 = 65.
7. x = 0
Subtract 2 from both sides: 5x = 0. Divide by 5: x = 0. Check: 5 × 0 + 2 = 2.
8. x = 7
Subtract 16 from both sides: 8x = 56. Divide by 8: x = 7. Check: 8 × 7 + 16 = 72.
9. x = 12
Subtract 1x from both sides: 1x + 9 = 21. Subtract 9: 1x = 12. Divide by 1: x = 12.
10. x = 8
Subtract 3x from both sides: 6x + 16 = 64. Subtract 16: 6x = 48. Divide by 6: x = 8.
11. x = -10
Subtract 1x from both sides: 1x + 15 = 5. Subtract 15: 1x = -10. Divide by 1: x = -10.
12. x = -3
Subtract 1x from both sides: 2x + 9 = 3. Subtract 9: 2x = -6. Divide by 2: x = -3.
Worked examples
Solve x + 3 = 12.
- Subtract 3 from both sides: x = 9.
- Check: 1 × 9 + 3 = 12.
- Answer: x = 9
Solve 6x + 18 = 72.
- Subtract 18 from both sides: 6x = 54.
- Divide by 6: x = 9.
- Check: 6 × 9 + 18 = 72.
- Answer: x = 9
Solve 9x + 13 = 3x + 7.
- Subtract 3x from both sides: 6x + 13 = 7.
- Subtract 13: 6x = -6.
- Divide by 6: x = -1.
- Answer: x = -1
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Does an operation to only one side.
Correction: Keep the balance — both sides, every time.
Uses the wrong inverse (subtracts to undo multiplying).
Correction: Undo × with ÷ and + with −.
Teacher tips
- · Always ask pupils to substitute their answer back in.
Parent tips
- · 'I think of a number' puzzles at dinner.
Real-life applications
- · Working out an unknown price or time from a total.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
- Is this Grade 3 Introducing Equations with Unknowns Both Sides Common Errors flashcards really free?
- 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 Introducing Equations with Unknowns Both Sides Word Problems, Introducing Equations with Unknowns Both Sides Techniques, Equations with Brackets. 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 Equations with Unknowns Both Sides Common Errors?
- Move on to Working with Equations with Unknowns Both Sides, Equations with Unknowns Both Sides in Context, which build directly on this idea.
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