Knowing factors will help you find a GCF. To simplify a fraction, divide the numerator and the denominator by their GCF.
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"Un" means "not." Unlike fractions are not alike.
Fractions greater than 1 are to the right of 1 and fractions less than 1 are to its left.
Finding the GCF will help you to simplify fractions.
Divisibility rules help you find the factors of a number. Once you've found the factors for two or more numbers, you can find what they have in common. Take 231 and 321. If you know the divisibility rules, you know that they are both divisible by 3, so 3 is a common factor.
The GCF will help you to simplify fractions.
Knowing the divisibility rules will help you by being able to recognize if a number has factors (other than one and itself) which are covered by the rules. This will save actually having to start doing divisions.
Knowing factors will help you find a GCF. To simplify a fraction, divide the numerator and the denominator by their GCF.
The divisibility rules will show that 53 is not divisible by anything other than 1 and itself. Since it is already prime, it doesn't have a factorization.
It helps you not to put the wrong answer and it helps you to not write anything down.
Factors of numbers are divisible by them with no remainders
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You can test successive prime numbers to see if your number is divisible by them, but knowing the divisibility rules will help you eliminate some steps, depending on what your number is. If your number is odd, you don't have to test for 2. If the sum of your number's digits do not total a multiple of 3, you don't have to test for 3. If your number doesn't end in a 5 or 0, you don't have to test for 5. Just by looking at your number, you can include or eliminate the three most common primes if you know the rules of divisibility.