The answer is 13.
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78 is not prime. No even number (except 2) is prime. Remember the definition. A prime number is exactly divisible only by itself and 1.
How about: 73+5 = 78
To find the greatest common factor (GCF) of 56, 78, and 130, we first need to find the prime factors of each number. The prime factors of 56 are 2 x 2 x 2 x 7, the prime factors of 78 are 2 x 3 x 13, and the prime factors of 130 are 2 x 5 x 13. To find the GCF, we look for the common prime factors among the numbers, which are 2 and 13. Therefore, the GCF of 56, 78, and 130 is 2 x 13 = 26.
78 6 x 13 (2x3) x 13 Since 2, 3, and 13 are prime numbers, the factor tree is complete.
One way to solve this is to multiply the lowest prime numbers together, starting from 2: 2x3=6. 6x5=30. Multiplying by 7 would yield a 3-digit number, so we are looking for all 2-digit numbers with 3 distinct prime factors. We already have 30. 2x3x7=42. 2x3x11=66. 2x3x13=78. 2x5x7=70. So, to answer the original question, the 2-digit numbers that have the most factors in their prime factorization are, in ascending order, 30, 42, 66, 70, and 78.