Zero divided by any number is 0. Division by 0 is
Examples:0/9 = 0 and 7/0 =undefind
Any number divided by itself is 1:
Example:6/6 = 1 and x/x = 1
Writing Fractions and Mixed Numbers The number 1 can be written as any fraction:
To write a whole number as a fraction, write the
whole number over 1:
Example:4 = 4/1
To write a mixed number as an improper fraction, multiply the whole number by the denominator, add
the numerator, and keep the denominator:
To write an improper fraction as a mixed number,
divide the numerator by the denominator. Use the
quotient to write the whole number. Place the
remainder in the numerator of the fraction, and keep
Rule for 2: If a number ends in 0, 2, 4, 6, or 8 (even
number), divide by 2.
Rule for 3: If the sum of a number ‘s digits is a multiple
of 3, divide by 3.
Rule for 5: If a number ends in 0 or 5, divide by 5.
Rule for 10: If a number ends in 0, divide by 10.
Prime Factorization A prime number can only be divided by itself and 1.
Primes: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 ...
To prime factor a number , divide the number by 2, 3,
5, 7 ... Then write the number as a product of its
60 = 2• 30
= 2• 2• 15
= 2• 2• 3• 5
= 22• 3• 5
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