Factors are numbers we can multiply together to get another number: Example: 2 and 3 are factors of 6, because 2 × 3 = 6. A number can have MANY factors!
So, an easy way of finding your answers is to look at a timetable charts and analyze what equals to 2,4 and #5.
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The common factors are: 1, 5 The Greatest Common Factor: GCF = 5
The highest common factor (HCF) of 245 and 210 is 35. To find the HCF, you need to identify the common factors of both numbers and then determine the highest one they share. In this case, the factors of 245 are 1, 5, 7, 35, 49, 245, and the factors of 210 are 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210. The highest common factor of 245 and 210 is 35 because it is the largest number that divides both 245 and 210 without leaving a remainder.
1, 5, 7, 35, 49, 245
As a product of its prime factors: 5*7*7 = 245
245 and what...?