SME
Grade 4 Math · Problem type
Prime and composite numbers
Use this to sort numbers as prime or composite by their factors.
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How many factors does it have?
Tap a card, then tap its group.
Assumptions
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A prime number has exactly two factors: 1 and itself.
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A composite number has more than two factors.
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1 has only one factor, so it is neither.
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Related lessons
Factors, multiples and patterns
Main lesson
Identify multiples
Use this for “Is 27 a multiple of 4?” or “Is 40 a multiple of 8?”
Number patterns
Use this for “Start at 3 and add 5 each time: 3, 8, 13, … What is the 5th number?”
Number patterns: find the rule
Use this for “What comes next? Write the rule” when a pattern adds, multiplies or takes turns between two steps.
Shape patterns
Use this for “Circle, square, triangle, circle, square, … What is the 10th shape?”