Algebra Directed Numbers Aims Aim To define what

Algebra Directed Numbers

Aims Aim • To define what positive and negative numbers are • To identify everyday situations where negative numbers are often used • Identify positive and negative numbers in context

Positive and Negative Numbers A positive number is greater than zero and is written with a positive (+) sign or no sign. Example +6 or 6 A negative number is less than zero and is written with a negative (-) sign. Example -6 -9 -8 -7 -6 -4 -3 -2 -1 1 2 3 4 6 7 8 9

Negative Numbers Negative numbers can often be used in different everyday situations • Lifts • Golf scores – par/over par/under par • Temperatures on thermometers • Movement of records in music charts • In history (AD and BC)

Positive and Negative Numbers Look at the number line. Can you find the missing numbers? -9 -8 -7 -6 -4 -3 -2 -1 1 2 3 4 0 6 7 8 9

Positive and Negative Numbers Look at the number line. Can you find the missing numbers? -9 -8 -7 -6 -4 -3 -2 -1 -10 -5 1 2 3 4 0 6 7 8 9 5 10

Positive and Negative Numbers -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 What is the difference between -2 and +4? What is the difference between +5 and -1? 6? What is the difference between -6 and +3? ? 9

Positive and Negative Numbers -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 What is the difference between -3 and +2? What is the difference between +7 and -2? ? ? What is the difference between -4 and +1? ?

Positive and Negative Numbers -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 What is the difference between -3 and +2? What is the difference between +7 and -2? 5 9 What is the difference between -4 and +1? 5