basic advanced

Is 2,481 divisible by 3? Explain.

Is 34,917,000 divisible by 6? Explain

Yes b/c 2+4+8+1= 15. And 15 is divisible by 3.

Yes b/c it ends in an even number (divisible by 2), and adds up to 24 (divisible by 3).

POD

Prime Factorization

Factors are the numbers you multiply together to get another number:

2 × 3 = 6factor factor

Prime Factorization is finding which prime numbers multiply together to make the original number.

To find the prime factors of a number create a factor tree.

Example 1:

482 24

2 122 6

2 3So, 48 = 2 × 2 × 2 × 2 × 3

or, 24 × 3

Whiteboard time:

362 18

2 93 3

So, 36 = 2 × 2 × 3 × 3

or, 22 × 32

15015 10

3 5 2 5

So, 150 = 2 × 3 × 5 × 5

or, 2 × 3 × 52

54010

542 27

3 93 3

So, 540 = 2 × 2 × 3 × 3 × 3 × 5

or, 22 × 33 × 5

2 5