Lisa_Directed Numbers

Slide 1: 

Ascending and Descending directed numbers By Lisa Mahon

Slide 2: 

Directed numbers and the number line As you move to the right on the number line, the numbers get As you move to the left, the numbers get bigger. smaller.

Slide 3: 

-1 0 1 2 3 4 5 6 7 8 9 -5 -4 -3 -2 -9 -8 -7 -6 Ascending Descending

Slide 4: 

-1 0 1 2 3 4 5 6 7 8 9 -5 -4 -3 -2 -9 -8 -7 -6 Arrange numbers in order from smallest to largest -5 -9 3 5 -4 0 8 -9, -5, -4, 0, 3, 5, 8 largest to smallest ascending

Slide 5: 

-1 0 1 2 3 4 5 6 7 8 9 -5 -4 -3 -2 -9 -8 -7 -6 Arrange numbers in order from largest to smallest -5 -9 3 5 -4 0 8 8, 5, 3, 0, -4, -5, -9 largest to smallest descending

Slide 6: 

Directed numbers are needed to represent temperatures, as sometimes readings involve negative numbers. A negative sign (-) indicates that the temperature is less than zero (0°C). A positive sign (+) indicates that the temperature is greater than zero. Positive numbers may be written without the sign. So + 10 is the same as 10.

Slide 7: 

Directed numbers are needed to represent temperatures, as sometimes readings involve negative numbers. A negative sign (-) indicates that the temperature is less than zero (0°C). A positive sign (+) indicates that the temperature is greater than zero. Positive numbers may be written without the sign. So + 10 is the same as 10.

Slide 8: 

Plot the temperature of - 3°C? 3°C means the temperature is 3°C colder than zero (0°C).

Slide 9: 

Write the temperature shown on each thermometer: The pink line is above zero, therefore, a positive number. The answer is 7

Slide 10: 

Write the temperature shown on each thermometer: The pink line is below zero, therefore, a negative number. The answer is -2

Slide 11: 

-1 0 1 2 3 4 5 6 7 8 9 -5 -4 -3 -2 -9 -8 -7 -6 Placing integers on the number line Plot these numbers (integers) on the number line -9 -3 2 7

Slide 12: 

-1 0 1 2 3 4 5 6 7 8 9 -5 -4 -3 -2 -9 -8 -7 -6