Flashcards · Maths · Ratio and Proportion
Units, Conversions and Scale
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How many millimetres are in a centimetre?
10.
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How many centimetres are in a metre?
100.
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How many metres are in a kilometre?
1000.
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How many grams are in a kilogram, and kilograms in a tonne?
1000 in each case.
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How many millilitres are in a litre?
1000.
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What is 1 cm\(^3\) in millilitres?
1 ml.
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When you convert from a big unit to a small unit, do you multiply or divide?
Multiply, because there are more small units.
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Change 3.6 km to metres.
\(3.6 \times 1000 = 3600\) m.
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Change 2450 g to kilograms.
\(2450 \div 1000 = 2.45\) kg.
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How many minutes are in 1.5 hours?
90 minutes.
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What does a map scale of \(1 : 25\,000\) mean?
1 cm on the map is 25 000 cm in real life, which is 250 m.
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A drawing has a scale of 1 cm to 2 m. What is the real length of a 6 cm line?
\(6 \times 2 = 12\) m.
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How do you find the length on a drawing from a real length?
Divide the real length by the scale.
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How many square centimetres are in 1 m\(^2\) (Higher tier)?
\(100 \times 100 = 10\,000\) cm\(^2\).
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How many cubic centimetres are in 1 m\(^3\) (Higher tier)?
\(100^3 = 1\,000\,000\) cm\(^3\).
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How many square millimetres are in 1 cm\(^2\) (Higher tier)?
\(10 \times 10 = 100\) mm\(^2\).