A. 17 × 50

**Answer 1**

didnt realise it was multiple choice!

only option is B as the others contain numbers that are divisible by several factors

B. 2 × 5 × 5 × 17

2 * 5 = 10

10 * 5 = 50

70*17=850

**Answer 2**

850 ÷ 2

= 425

425 ÷ 5

= 85

85 ÷ 5

= 17

∴ 850 = 2 x 5 x 5 x 17

(answer B)

**Answer 3**

if you look at the choices, you will find that in A, C, and D you will find you will find factors that are not prime (50, 10, 10) therefore, the correct answer would be B. also, you could use a factor tree:

850

17×50

17x2x25

17x2x5x5 which is the same as 2 x 5 x 5 x 17

**if you ever have to write the prime factorization in exponenets, it would be:

2 x 5^2 x 17

**Answer 4**

A prime factor is a number that can’t be divided by anything other than 1 and itself to get a whole number.

Tip: Any even number except 2 can be reduced by dividing by 2, so 50 and 10 can’t be prime factors, eliminating A and D as possibilities.

Tip: Any number greater than 5 that ends with a 5 or a 0 can be divided by 5, so 85 can’t be a prime factor.

So B.

**Answer 5**

2 X 5 X 5 X 17

so B

**Answer 6**

the answer your looking for is:

B. 2*5*5*17

**Answer 7**

B