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Practice questions

1 Find the ‘maths mistakes’ in the following.

2C Numbers you meet

In this section, we’ll explore the most common numbers we meet in our daily lives. Take a close look at the weather forecast below, which contains lots of different types of numbers. What types of numbers can you see?

MT HOTHAM 7-DAY WEATHER FORECAST HoverYourMouseOverAnyForecastItemToIdentifyItsSource

ChanceofRain50%10%50%90%20%5%10%

WindDirection SSWSWSWWNWNNWNNWNNWNWSWSSWESEWNWNNNW

RelativeHumidity87%87%90%84%96%87%87%93%77%70%69%63%74%68% DewPoint–6˚C–4˚C–1˚C2˚C1˚C2˚C0˚C2˚C–8˚C–6˚C–5˚C–2˚C–1˚C0˚C

The numbers we see regularly in daily life can be the following.

• Whole numbers like 22, 450, $400 000.

• Negative numbers like –6 or –8.

• Fractions like 4 5 , 1 2

• Decimals like 0.3, 43.6.

• Percentages like 10%, 17.5%.

• Rates like 34 km/h, 7.1L/100km, $7,386.55 per kg.

Numbers can be in dollars, such as $5 million or $500 000. They can be written using digits, like 450, 3 4 , 5th or 0.05, or written using words, like two, half or ten thousand.