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Year 7 - Prime factorisation
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Which number has more than 1 prime factor
12 = 2, 3,
What number is represented by the prime factor tree
27
Which student is wrong?
Chantelle
If you use the cards shown to write 132 as a product of its prime factors, which three cards will you have left over?
3,5,7
Use the factor tree to write 36 as a product of its prime factors. Give your answer in the form a × b × . . . and write the factors in ascending order.
2 × 2 × 3 × 3
Write 42 as a product of its prime factors. Give your answer in the form a × b × . . . and write the factors in ascending order.
2x3x7
What is the missing prime factor
13
How old is Freddie?
14
Is this always, sometimes, or never a multiple of 4. Why?
Sometimes... when x=2, no as answer = 0
Is this correct? Explain
Yes - Every number can be broken down in to prime factors
What is the next number in this sequence?
25
What are the common factors?
5, b, 5b
Write 26 as a product of it's prime factors
13 x 2
What is the missing prime factor?
7
Select the numbers that are prime factors of both 294 and 315
3,7
5 is a factor of both 10 and 15. Which other number is a common factor of 10 and 15?
1
What are the first five square numbers?
1, 4, 9, 16, 25
Which number is a prime number?
19
Which of the following numbers is a multiple of both 6 and 9?
18
Which number (other than 1) is a common factor of 14 and 35?
7
Which factor of 18 is missing from the table?
6


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