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Prime & Composite Numbers — Easy Worksheet 1
Grade 4 · MathSheets Name: ____________________ Date: __________
Answer each question about prime and composite numbers. The same idea comes in different shapes.
How to solve
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Example
Is 13 prime or composite?
Answer: prime
Warm-up
Not quite. The answer is
💡 Try dividing 19 by 2, 3: none of them divides it evenly. The only factors of 19 are 1 and 19, so 19 is prime.
✓ Correct!
Not quite. The answer is
💡 Try dividing 19 by 2, 3: none of them divides it evenly. The only factors of 19 are 1 and 19, so 19 is prime.
💡 How to solve: Prime & Composite Numbers
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Try a similar one
Is 8 prime or composite?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 10 = 2 × 5, so 10 has a factor other than 1 and itself. So 10 is composite.
✓ Correct!
Not quite. The answer is
💡 10 = 2 × 5, so 10 has a factor other than 1 and itself. So 10 is composite.
💡 How to solve: Prime & Composite Numbers
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Try a similar one
Is 16 prime or composite?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Try dividing 11 by 2, 3: none of them divides it evenly. The only factors of 11 are 1 and 11, so 11 is prime.
✓ Correct!
Not quite. The answer is
💡 Try dividing 11 by 2, 3: none of them divides it evenly. The only factors of 11 are 1 and 11, so 11 is prime.
💡 How to solve: Prime & Composite Numbers
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Try a similar one
Is 15 prime or composite?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Picture it
Not quite. The answer is
💡 The dots only make one row, so 3 has just two factors: 1 and 3. So 3 is prime.
✓ Correct!
Not quite. The answer is
💡 The dots only make one row, so 3 has just two factors: 1 and 3. So 3 is prime.
💡 How to solve: Prime & Composite Numbers
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Try a similar one
Is 29 prime or composite?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 2 rows of 10 means 2 × 10 = 20, so 20 has factors other than 1 and 20. So 20 is composite.
✓ Correct!
Not quite. The answer is
💡 2 rows of 10 means 2 × 10 = 20, so 20 has factors other than 1 and 20. So 20 is composite.
💡 How to solve: Prime & Composite Numbers
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Try a similar one
Is 11 prime or composite?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Think it through
Not quite. The answer is
💡 3 has exactly two factors, 1 and itself, so 3 is prime.
✓ Correct!
Not quite. The answer is
💡 3 has exactly two factors, 1 and itself, so 3 is prime.
💡 How to solve: Prime & Composite Numbers
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Try a similar one
Is 20 prime or composite?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Divide: 9 ÷ 3 = 3. So 3 × 3 = 9.
✓ Correct!
Not quite. The answer is
💡 Divide: 9 ÷ 3 = 3. So 3 × 3 = 9.
💡 How to solve: Prime & Composite Numbers
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Try a similar one
Is 2 prime or composite?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Challenge
Not quite. The answer is
💡 Check the numbers after 14: 15 = 3 × 5, 16 = 2 × 8, so they are composite. 17 has no factors except 1 and 17, so the next prime is 17.
✓ Correct!
Not quite. The answer is
💡 Check the numbers after 14: 15 = 3 × 5, 16 = 2 × 8, so they are composite. 17 has no factors except 1 and 17, so the next prime is 17.
💡 How to solve: Prime & Composite Numbers
A prime number has exactly two factors: 1 and itself (like 7). A composite number has more than two factors (like 8 = 2 × 4). Try dividing by 2, 3, 5 and 7: if one divides evenly, the number is composite. The number 1 is neither.
Try a similar one
Is 19 prime or composite?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Prime & Composite Numbers — Easy Worksheet 1
Answer each question about prime and composite numbers. The same idea comes in different shapes.