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1.19 Temperatures

Mathematics

Having fun with pocket calculators and negative numbers

Educator section

Memorandum

<
–30 degrees Celsius = -22 degrees Farenheit

21. a) Storm petrel en king penguin

c) I) 75 degrees

Il) 50 degrees

70 degrees

d) No. Can not survive in temperatures below freezing point.

No. Can not survive in tempretures less than -10 degrees.
-125 degrees

22. x = 12; 3

x – 9 + 4: 0; -8; -12; -23

Leaner section

Content

Activity: temperatures [lo 2.6, lo 2.1]

20. DID YOU KNOW?

Water freezes at 0°C and boils at 100°C. A Swedish astronomer discovered the Celsius scale. Examine the difference between the Celsius scale and the Fahrenheit scale.

20.1 Fill in:<;>or = : -30 ........ -22

20.2 According to the thermometer on the previous page -30°C = -22°F. Explain how this is possible.

_____________________________________________________________________

21. Look at the maximum and minimum temperatures that these living organisms are able to withstand. Then answer the questions that follow.

a) Who / what can survive at -60°C? ___________________________________

b) Can an earthworm survive temperatures below freezing point?

_____________________________________________________________________

c) What is the difference between the minimum and maximum temperatures at which the following living organisms can exist?

i) storm petrel ____________________________________________________

ii) housefly _______________________________________________________

iii) king penguin ___________________________________________________

d) Will a garden snail be able to survive in London in December?

_____________________________________________________________________

Motivate your answer.

_____________________________________________________________________

e) Do you think that you will find many houseflies around the North Pole? _____________________________________________________________________

_____________________________________________________________________

Motivate your answer.

_____________________________________________________________________

f) Take another look at the illustration. What is the sum of the minimum temperatures for all the organisms?

_____________________________________________________________________

22. Can you complete the following table?

x	5	–3	–7			–18
x - 9 + 4				7	–2

Assessment

Learning Outcome 2: The learner will be able to recognise, describe and represent patterns and relationships, as well as to solve problems using algebraic language and skills.

Assessment Standard 2.1: We know this when the learner investigates and expands numeric and geometric patterns looking for a relationship or rules, including patterns;

Assessment Standard 2.6: We know this when the learner describes a situation by interpreting a graph of the situation, or draws a graph from a description of a situation (e.g. height of a roller-coaster car over time; the speed of a racing car going around a track).

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Read also:

OpenStax, Mathematics grade 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11075/1.1

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