London 13C
Montreal -11C
If I travel instantly from London to Madrid:
Does the temperature rise or fall? By how much?
Madrid to Moscow?
Moscow to Montreal?
Cairo is 30° warmer than Montreal.
What is the temperature in Cairo?
Moscow -8C
Madrid 20C
Lesson Objectives
By the end of the lesson, I will be able to…..
-order directed numbers (Level 4)(Grade F)
-add and subtract negative numbers in context (Level 5)(Grade E)
Key Words
Directed
numbers
Negative
Positive
Final temperature missing
Verkhoyansk
Verkhoyansk
Wellington
to Wellington
–40 °C
+55 °C
?
Starting temperature + change = final temperature:
–40 + (+55) = +15
Lesson Objectives
By the end of the lesson, I will be able to…..
-order directed numbers (Level 4)(Grade
4)
F)
-add and subtract negative numbers in context (Level 5)(Grade
5)
E)
Key Words
Directed
numbers
Negative
Positive
Starting temperature missing
Khartoum
Khartoum to Sydney
?
–10 °C
Sydney
+25 °C
Final temperature – change = starting temperature:
+25 – (–10) = +35
Lesson Objectives
By the end of the lesson, I will be able to…..
-order directed numbers (Level 4)(Grade
4)
F)
-add and subtract negative numbers in context (Level 5)(Grade
5)
E)
Key Words
Directed
numbers
Negative
Positive
Change missing temperature
Sydney Sydney to Verkhoyansk
Verkhoyansk
25 °C
?
–40 °C
Final temperature – initial temperature =
change in temperature:
–40 – (+25) = – 65
Lesson Objectives
By the end of the lesson, I will be able to…..
-order directed numbers (Level 4)(Grade
4)
F)
-add and subtract negative numbers in context (Level 5)(Grade
5)
E)
Key Words
Directed
numbers
Negative
Positive
Combining changes
Khartoum
Sydney
Khartoum
to Sydney
to Moscow
to Moscow
–10 °C
–35 °C ?
First change + second change = combined change:
–10 + (–35) = –45
Lesson Objectives
By the end of the lesson, I will be able to…..
-order directed numbers (Level 4)(Grade
4)
F)
-add and subtract negative numbers in context (Level 5)(Grade
5)
E)
Key Words
Directed
numbers
Negative
Positive
Level 5 question
Lesson Objectives
By the end of the lesson, I will be able to…..
-order directed numbers (Level 4)(Grade
4)
F)
-add and subtract negative numbers in context (Level 5)(Grade
5)
E)
Key Words
Directed
numbers
Negative
Positive
Grade F question
The table gives information about the midday temperatures in four cities on
one day in December.
City
Temperature (C)
Moscow
10
Washington
10
Canberra
25
Toronto
12
(a) How many degrees higher was the temperature in Washington than the
temperature in Toronto?
.................. °C
(2 marks)
(b) Work out the difference in temperature between Moscow
and Toronto.
.................. °C
(1 mark)
(c) For which two cities was there the greatest difference in
temperature?
(2 marks)
Lesson Objectives
By the end of the lesson, I will be able to…..
-order directed numbers (Level 4)(Grade
4)
F)
-add and subtract negative numbers in context (Level 5)(Grade
5)
E)
Key Words
Directed
numbers
Negative
Positive