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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