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What is the factor tree for 21?
21 3,7
How do you make a factor tree for 189?
First, find two numbers that when multiplied together equal 189. I can tell by looking at the number that it is divisible by 9. Any number whose digits add up to a number divisible by 9 is also divisible by 9. 1 + 8 + 9 = 18, which is divisible by 9. 189 ÷ 9 is 21. So, the top of our factor tree is: 189 9 x 21 Now, determine two pairs of numbers that when multiplied together, one pair will equal 9 and the other pair will equal 21. 9 = 3 x 3 and 21 = 7 x 3. So, now our factor tree is: 189 9 x 21 (3x3) x (7x3) You would continue doing this until you no more numbers can be factored. Since 3 and 7 are prime numbers, the factor tree is finished. The factor tree shows that the prime factorization of 189 is 3 x 3 x 3 x 7 or 33 x 7.
What is the factor tree of 40?
Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
What is the highest common factor of 21 and 105?
Since 21 is a factor of 105, it is automatically the GCF.
Factor pairs of twenty one?
There are two factor pairs of 21: 21 = 1 x 21 21 = 3 x 7
