Working with numbers

Working with numbers

1. Adding negatives and positives

   • positive numbers - to the right
     • Negative numbers - to the left

2. How to work out the highest common factor (HCF) and the lowest common multiple (LCM)

   • 1. Sort the two numbers into their prime factors
     • 2.Circle the prime numbers
       • 3. Draw a Venn diagram with the two numbers prime factors.
         • To find the HCF you multiple the middle section
           • To find the LCM you
             • Add all the numbers in the venn diagram and divide by the number of numbers.

3. Working with negative and positive numbers

   • Multiplying and Dividing negative numbers
     • When multiplying or dividing a positive number by another number results in a positive number
       • When multiplying or dividing a negative number by a positive number it results in a negative number
         • this = (+) x (+) = (+)
           • (+) divided by (+) = (+)
             • (-) x (+) = (-)
               • (-) dived by (+) = (-)

4. Squared numbers

   • To square a number you times by itself
     • Eg. 5 to the power of 2 = 5 x 5 = 25
       • So 5 squared =25

5. Square Roots

   • The square root of 25 would be 5 because 5 x 5 = 25