Page 18 - 新思维数学学生用书4 样章

1.2 More on negative numbers

5 The temperature in a town one day was 5 °C.

The temperature dropped by 9 °C overnight.

What was the lowest night-time temperature?

6 The letters on the number line are in the place of numbers.

−10 0 10

A B C D E F G H I J K L M N O P Q R S T U

Copy and complete the table to solve the puzzle and find

out where emperor penguins live.

−10 3 9 −10 7 −8 9 −2 −8 −10

7 What mistake has Marcus made?

How can you help him correct Negative 5 °C is

this mistake? warmer than negative

8 a What temperature is 4 °C because 5 is bigger
6 degrees warmer than than 4.

−4 °C?

b What temperature is 5 degrees less than 1 °C?

c What temperature is 3 degrees warmer than −2 °C?

d What temperature is 3 degrees cooler than 0 °C?
e What temperature is 5 degrees higher than −1 °C?

Number lines are useful for calculating and showing connections

between values. Sometimes one is drawn for you, but sometimes
you can draw your own to help.

Look at the questions in the exercise and write down how you

have used number lines to help you.

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