Free Grade 3 Introducing Prime Numbers Essentials Flashcards
Free Grade 3 flashcards for Introducing Prime Numbers Essentials: 12 real questions with a full answer key and worked solutions. Factors divide a number exactly; multiples are in its times table. The HCF is the biggest shared factor, the LCM the smallest shared multiple.
Free
Core
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing prime numbers essentials
Identify introducing prime numbers essentials accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing prime numbers essentials
Explain introducing prime numbers essentials accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing prime numbers essentials
Calculate introducing prime numbers essentials accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing prime numbers essentials
Compare introducing prime numbers 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 Prime Numbers Essentials works
Factors divide a number exactly; multiples are in its times table. The HCF is the biggest shared factor, the LCM the smallest shared multiple.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.List all the factors of 18.[1]
- 2.List all the factors of 40.[1]
- 3.List all the factors of 30.[1]
- 4.List all the factors of 28.[1]
- 5.Find the highest common factor (HCF) of 35 and 35.[2]
- 6.Find the highest common factor (HCF) of 42 and 28.[2]
- 7.Find the highest common factor (HCF) of 49 and 35.[2]
- 8.Find the highest common factor (HCF) of 24 and 28.[2]
- 9.Find the lowest common multiple (LCM) of 42 and 49.[3]
- 10.Find the highest common factor (HCF) of 12 and 12.[3]
- 11.Find the lowest common multiple (LCM) of 18 and 12.[3]
- 12.Find the lowest common multiple (LCM) of 21 and 28.[3]
Show answers and working
1. 1, 2, 3, 6, 9, 18
Find factor pairs that multiply to 18. 1 × 18 2 × 9 3 × 6
2. 1, 2, 4, 5, 8, 10, 20, 40
Find factor pairs that multiply to 40. 1 × 40 2 × 20 4 × 10 5 × 8
3. 1, 2, 3, 5, 6, 10, 15, 30
Find factor pairs that multiply to 30. 1 × 30 2 × 15 3 × 10 5 × 6
4. 1, 2, 4, 7, 14, 28
Find factor pairs that multiply to 28. 1 × 28 2 × 14 4 × 7
5. 35
List factors of 35 and 35. The largest factor they share is 35.
6. 14
List factors of 42 and 28. The largest factor they share is 14.
7. 7
List factors of 49 and 35. The largest factor they share is 7.
8. 4
List factors of 24 and 28. The largest factor they share is 4.
9. 294
HCF(42, 49) = 7. LCM = 42 × 49 ÷ 7 = 294.
10. 12
List factors of 12 and 12. The largest factor they share is 12.
11. 36
HCF(18, 12) = 6. LCM = 18 × 12 ÷ 6 = 36.
12. 84
HCF(21, 28) = 7. LCM = 21 × 28 ÷ 7 = 84.
Worked examples
List all the factors of 20.
- Find factor pairs that multiply to 20.
- 1 × 20
- 2 × 10
- 4 × 5
- Answer: 1, 2, 4, 5, 10, 20
Find the highest common factor (HCF) of 42 and 30.
- List factors of 42 and 30.
- The largest factor they share is 6.
- Answer: 6
Find the highest common factor (HCF) of 27 and 27.
- List factors of 27 and 27.
- The largest factor they share is 27.
- Answer: 27
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Mixes up factors and multiples.
Correction: Factors are Few (they fit inside), multiples are Many (they go on forever).
Misses factor pairs.
Correction: Work through 1, 2, 3… in order until the pairs meet.
Teacher tips
- · Use factor rainbows to show pairs.
Parent tips
- · Ask how many ways 24 sweets can be put into equal bags.
Real-life applications
- · Arranging chairs in equal rows, syncing bus timetables (LCM).
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
- Is this Grade 3 Introducing Prime Numbers Essentials 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 Multiples. 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 Prime Numbers Essentials?
- Move on to Introducing Prime Numbers Techniques, Introducing Prime Numbers Word Problems, Introducing Prime Numbers Common Errors, Working with Prime Numbers, which build directly on this idea.
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