( If you can use the same Prime number twice) The answer is 2, 2, and 5.

2 x 2 = 4 --> 4 x 5 = 20

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7 + 13 = 20 Note that there are no two prime numbers x and y that multiply to 20.

2,2,5

360

20 = 2 x 2 x 5

20 = 2 x 2 x 5

2 x 2 x 5 = 20

23

-22

These are the prime numbers 1-20 2,3,5,7,11,13,17,19

Prime factors of 20 are: 22 and 5 Prime factors of 250 are: 2 and 53 Multiply the highest prime numbers: 22*53 = 500 which is the LCM

No. Prime factors are the numbers that make up other numbers, but they have to be prime. Prime factorisation is the process of finding the prime numbers that create a number. This is when you multiply the prime numbers together and the product is the original number. For example: 20 5x4 5x2x2 This process is called prime factorisation. In this case, the prime numbers are 2, 2, and 5.

2 * 10 4 * 5 1 * 20 these are all whole integer factors.

2/5 of the numbers from 1 to 20 are prime numbers

23 and 29

38

20, 4 and 2 if you add them. 13, 2 and 1 if you multiply them.

23 and 29

-20 and 80 -20*80=-1600 -20+80=60

13 + 7 1 + 193 + 17

40. All three numbers will equal each other when they multiply to 40.

The prime factors of 20 are 2x2x5.

To work this out, you need to write both numbers as their prime factors: 20 = 2x2x5 12 = 2x2x3 The next step is to identify any common prime factors. In this case both numbers have two 2s as prime factors. Multiply these together and you get 4. Therefore 4 is the HCF of 20 and 12.

80

10 and 20 are composite numbers, not prime numbers. The prime factorization of 10 is 2 x 5. The prime factorization of 20 is 2 x 2 x 5.

You can multiply 1 and 20, 2 and 10, 4 and 5.