GCSE Secondary Maths Age 13-17 - Number: Multiples and Factors - Explained

The video tutorial explains a math problem where Jen needs to find three numbers: one multiple of nine and two different factors of 40. The sum of these numbers should be greater than 20 but less than 30. The teacher lists multiples of nine and factors of 40, then demonstrates choosing 9, 10, and 5 to achieve a sum of 24. The tutorial also discusses the marks allocation for the problem, emphasizing careful reading of the question.

What is the range within which the sum of Jen's three numbers must fall?

• 20 to 30

• 10 to 20

• 40 to 50

• 30 to 40

Which of the following is a multiple of nine?

• 8

• 10

• 18

• 20

Which pair of numbers are factors of 40?

• 3 and 6

• 7 and 8

• 4 and 10

• 5 and 9

What numbers did Jen choose to achieve a sum of 24?

• 9, 8, and 7

• 9, 10, and 5

• 18, 1, and 5

• 9, 4, and 11

How many marks were awarded for writing out the multiples of nine or the factors of 40?

• No marks

• Three marks

• Two marks

• One mark