That's its actual smallest factor, and its largest factor is 120. First, addition and subtraction:.

## Finding factors of a number

A far more efficient way, is to look for pairs of factors whose product is 12. Exercise 18 Write 201 as a sum of powers of 2. You need custom development? The number 1 divides all numbers. It is not divisible by 8 because 8 does not go into 988 evenly.

Suppose that each number in the table is divided by 7 to produced a quotient and a remainder. Show how to calculate these expressions using the index laws to work with powers of 10.

The later module The Index Laws extends the indices to any rational number. Think about the powers of 2. The three-part example below indicates how this relationship can be proven from the relationship above, although such a proof would be unsuited for most Year 7 students. The last digit is a 5.

The factors of a number can be displayed using rectangular arrays. It is divisible by 2, 5, and 10.

The highest common factor HCF and lowest common multiple LCM allow us to compare numbers in terms of their factors and multiples. Source s: This number ends in 400.... What number's go into 100? Divisibility by powers of 10 is particularly simpleâ€”just count the number of zeroes.

Computers use a base 2 place-value system, so computer programmers need to know the powers of 2, and must be able to convert numbers quickly to a sum of powers of 2.

The Rule for 10: Obtain the previous results on the addition and multiplication of odd and even numbers by algebra.

## Divisibility Rules: 2, 4, 8 and 5, 10

How many hours is 12Pm-2: It goes into 12 one time. How do you convert 100,8 into a common fraction or mixed number? As we saw earlier in the module, we can arrange 3 2 dots in a square and 3 3 dots in a cube:. A nonzero whole number has only a finite number of factors, so it has a greatest factor.