Cambridge Primary Math - Factor and Multiple

3/4/2019 10:19:00 PM
Factor (ước số) và Multiples (bội số) là một trong những chủ đề có trong chương trình Cambridge Primary (grade 5), nhưng là kiến thức mới với HS lớp 5 Việt Nam. Các câu hỏi trong bài này là những câu hỏi ở mức độ cơ bản, được trích từ chương trình toán Singapore online nổi tiếng tên là Koobits.

Definition:

Factors and multiples are different things. But they both involve multiplication:

  • Factors are what we can multiply to get the number
  • Multiples are what we get after multiplying the number by an integer (not a fraction).

Example: the positive factors, and some multiples, of 6:

Factors:

  • 1 × 6 = 6, so 1 and 6 are factors of 6
  • 2 × 3 = 6, so 2 and 3 are factors of 6

Multiples:

  • 0 × 6 = 0, so 0 is a multiple of 6
  • 1 × 6 = 6, so 6 is a multiple of 6
  • 2 × 6 = 12, so 12 is a multiple of 6
  • and so on

The first five multiples of 9 are 9, , 27, 36, .

Determine if 5 is a factor of 45?

  • Yes
  • No

The number of seashells that Minnie has is the first common multiple of 8 and 10. Minnie's sister has 5 times as many seashells as Minnie. How many seashells does Minnie's sister have?: seashells.

What is 3 multiplied by the first common multiple of 2 and 4?: .

What is 3 multiplied by the first common multiple of 2 and 6?: .

What is 6 multiplied by the first common multiple of 3 and 8?: .