basi c 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 POD
Dec 16, 2015
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