Free Grade 3 Geometric Sequences in Context Lesson Plans
Free Grade 3 lesson plans for Geometric Sequences in Context: 12 real questions with a full answer key and worked solutions. An arithmetic sequence goes up or down by the same amount each time. The nth term is (difference)n plus an adjustment.
Free
Core
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain geometric sequences in context
Explain geometric sequences in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate geometric sequences in context
Calculate geometric sequences in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare geometric sequences in context
Compare geometric sequences in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify geometric sequences in context
Justify geometric sequences in context 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 Geometric Sequences in Context works
An arithmetic sequence goes up or down by the same amount each time. The nth term is (difference)n plus an adjustment.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.Find the next two terms: 9, 12, 15, 18, …[1]
- 2.Find the next two terms: 17, 19, 21, 23, …[1]
- 3.Find the next two terms: 8, 13, 18, 23, …[1]
- 4.Find the next two terms: 9, 14, 19, 24, …[1]
- 5.Find the nth term of 19, 22, 25, 28, …[2]
- 6.Find the nth term of 13, 22, 31, 40, …[2]
- 7.Find the nth term of 5, 14, 23, 32, …[2]
- 8.Find the nth term of 6, 3, 0, -3, …[2]
- 9.Find the nth term of 10, 4, -2, -8, … and the 50th term.[3]
- 10.Find the nth term of 8, 2, -4, -10, … and the 50th term.[3]
- 11.Find the nth term of 6, 1, -4, -9, … and the 50th term.[3]
- 12.Find the nth term of 16, 18, 20, 22, … and the 50th term.[3]
Show answers and working
1. 21, 24
The difference is 3. 18 + 3 = 21, then 24.
2. 25, 27
The difference is 2. 23 + 2 = 25, then 27.
3. 28, 33
The difference is 5. 23 + 5 = 28, then 33.
4. 29, 34
The difference is 5. 24 + 5 = 29, then 34.
5. 3n + 16
Common difference 3, so start with 3n. 3 × 1 = 3; the first term is 19, so adjust by 16. nth term = 3n + 16
6. 9n + 4
Common difference 9, so start with 9n. 9 × 1 = 9; the first term is 13, so adjust by 4. nth term = 9n + 4
7. 9n − 4
Common difference 9, so start with 9n. 9 × 1 = 9; the first term is 5, so adjust by -4. nth term = 9n − 4
8. -3n + 9
Common difference -3, so start with -3n. -3 × 1 = -3; the first term is 6, so adjust by 9. nth term = -3n + 9
9. -6n + 16; 50th term = -284
Common difference -6, so start with -6n. -6 × 1 = -6; the first term is 10, so adjust by 16. nth term = -6n + 16
10. -6n + 14; 50th term = -286
Common difference -6, so start with -6n. -6 × 1 = -6; the first term is 8, so adjust by 14. nth term = -6n + 14
11. -5n + 11; 50th term = -239
Common difference -5, so start with -5n. -5 × 1 = -5; the first term is 6, so adjust by 11. nth term = -5n + 11
12. 2n + 14; 50th term = 114
Common difference 2, so start with 2n. 2 × 1 = 2; the first term is 16, so adjust by 14. nth term = 2n + 14
Worked examples
Find the next two terms: 6, 12, 18, 24, …
- The difference is 6.
- 24 + 6 = 30, then 36.
- Answer: 30, 36
Find the nth term of 15, 22, 29, 36, …
- Common difference 7, so start with 7n.
- 7 × 1 = 7; the first term is 15, so adjust by 8.
- nth term = 7n + 8
- Answer: 7n + 8
Find the nth term of 14, 18, 22, 26, … and the 50th term.
- Common difference 4, so start with 4n.
- 4 × 1 = 4; the first term is 14, so adjust by 10.
- nth term = 4n + 10
- Answer: 4n + 10; 50th term = 210
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Writes n + 3 for a sequence going up in 3s.
Correction: Going up in 3s means 3n.
Forgets to adjust for the first term.
Correction: Compare 3n with the actual sequence.
Teacher tips
- · Line the sequence up under the times table to find the adjustment.
Parent tips
- · Track weekly savings and predict week 10.
Real-life applications
- · Taxi fares, saving the same amount each week.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
- Is this Grade 3 Geometric Sequences in Context lesson plan really free?
- Yes. Every lesson plans 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 Working with Geometric Sequences, Introducing Geometric Sequences, Quadratic Sequences. Each one has its own free lesson, worksheet and quiz.
- How is the lesson plan 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 Geometric Sequences in Context?
- Move on to Term-to-term Rules, nth Term of a Linear Sequence, Quadratic Sequences, which build directly on this idea.
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