The factors of 81 are 1, 3, 9, 27 and 81. If a number is divisible by another number, it is a factor of the given number. If there is a remainder, it cannot be a factor of the given number.
Every number is a factor of itself. The number one is a factor of every number. Thus, every number except 1 has at least two factors. Prime factors are numbers that are factors and prime at the same time. The number 81 has five factors but only one prime factor, the number 3. Factorization is very important in algebra.
Learn MoreWhen teaching the multiplication tables, adding doubles can help young students comprehend the principles of multiplying by two. A teacher can also demonstrate that learning the multiplication tables involves doing repeated addition.
Full Answer >Numbers that multiply to give you a larger number are called factors. Use a factor tree for an easy way to factor larger numbers.
Full Answer >The square root of 185 is 13.60. Although a square root function can sometimes be simplified by factoring out the square root of a whole number, 185 does not have any factors that are squares of whole numbers and cannot be reduced.
Full Answer >Round a number to the place value of an underlined digit by leaving the underlined digit unchanged or increasing it by one and then changing all the digits to the right of it into zeros. Determine if the underlined digit should be increased or left alone by focusing on the digit directly to its right.
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