NumihanaWhich option is a common factor of 18 and 24?
Answer: 6 / 4 / 5 / 7
LEARN, PRINT & PRACTISE
Common factors.
Recognise a factor shared by two whole numbers.
Numihana · England Year 5
Common factors
Practice sheet
Name: ______________
Date: ______________
Recognise a factor shared by two whole numbers.
Which option is a common factor of 20 and 30?
Answer: 5 / 3 / 4 / 6
Which option is a common factor of 60 and 60?
Answer: 10 / 7 / 8 / 9
Which option is a common factor of 56 and 14?
Answer: 7 / 3 / 4 / 5
Which option is a common factor of 25 and 35?
Answer: 5 / 2 / 3 / 4
Which option is a common factor of 42 and 12?
Answer: 6 / 4 / 5 / 7
Numihana · England Year 5
Common factors
Answer key
Name: ______________
Date: ______________
Recognise a factor shared by two whole numbers.
Which option is a common factor of 18 and 24?
Answer: 6
Which option is a common factor of 20 and 30?
Answer: 5
Which option is a common factor of 60 and 60?
Answer: 10
Which option is a common factor of 56 and 14?
Answer: 7
Which option is a common factor of 25 and 35?
Answer: 5
Which option is a common factor of 42 and 12?
Answer: 6
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The skill behind this activity
Recognise a factor shared by two whole numbers.
Department for Education: mathematics programmes of study ↗
Year 5 → Number → Multiplication and division · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.
For teachers and parents
Test each option by division. A common factor divides both numbers exactly.
A common slip
A factor divides a number; a multiple is a product of that number.
Worked example
Which option is a common factor of 21 and 21?
Answer: 7
Test each option by division. A common factor divides both numbers exactly.