Units, Conversions and Compound Measures
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Units, Conversions and Compound Measures — Free MYP4 Mathematics (Extended) Practice Questions

1QuestionDensity Mass and VolumeConcept Practice
2 marks~3 minCriterion A
A furniture maker tests a rectangular block of oak before use in a project. The block has the following dimensions:

Length: 20 cm
Width: 10 cm
Height: 3 cm

The mass of the block is 480 g. Oak suitable for the project must have a density strictly greater than 0.75 g/cm³.

Density=MassVolume\text{Density} = \frac{\text{Mass}}{\text{Volume}}

Calculate the density of the block, then advise the furniture maker whether this block of oak should be used in the project. Justify your answer. [2]
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Solutions

2QuestionConverting Between Metric UnitsAssessment Practice
4 marks~6 minCriterion D
A city planner collects rainfall data in litres (L) to estimate the volume of water entering a reservoir. The estimated volume is then converted to cubic metres (m3\text{m}^3) to assess the reservoir's capacity, using 1 m3=1000 L1 \, \text{m}^3 = 1000 \, \text{L}.
a
Explain how to convert a volume given in litres to cubic metres, using the conversion factor above. [1]
b
Explain one advantage of using rainfall data to estimate reservoir inflow for water resource management. [1]
c
The city planner uses only rainfall data to predict the actual volume of water stored in the reservoir. Critique this approach by identifying two distinct limitations, explaining how each causes the predicted volume to differ from the actual volume. [2]
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Solutions

3QuestionConverting Between Metric UnitsAssessment Practice
6 marks~9 minCriterion C
A satellite image analyst measures features at three scales. Each measurement is the side length of a square region.

Square A: side =1 mm= 1 \ \text{mm}
Square B: side =1 cm= 1 \ \text{cm}
Square C: side =1 dm= 1 \ \text{dm}
a
Calculate the area of each square in mm2\text{mm}^2, cm2\text{cm}^2, and m2\text{m}^2. [3]
b
A colleague claims: "To convert an area measurement, you use the same conversion factor as for length." Using your results from part (a), deduce the correct general rule for converting between area units, and identify the error in the colleague's claim. [2]
c
Justify why area unit conversions require the linear conversion factor to be squared, relating your reasoning to the definition of area as a two-dimensional measure. [1]

Solutions

4QuestionMulti-Step Problems with Compound MeasuresAssessment Practice
6 marks~9 minCriterion B
A manufacturer produces solid metal cubes of increasing side lengths, all from the same material. The side lengths and measured masses are recorded below.

Side length ss (cm): 1, 2, 3, 4, 5

Mass MM (g): 2, 8, 18, 32, 50
a
Analyse the mass values to identify the relationship between MM and ss. Show the first and second differences between consecutive mass values and justify why the relationship is quadratic. [2]
b
Deduce a formula for the density DD (g/cm³) of a cube in terms of its side length ss, using D=MVD = \dfrac{M}{V}. Show all working. [2]
c
The manufacturer requires a cube of side length 6 cm to have a density no greater than 0.30 g/cm³ to meet a safety specification. Using your formula from part (b), advise the manufacturer whether this cube meets the specification and recommend one practical course of action if it does not. [2]

Solutions

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