Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 Using this table, which mineral is the least dense?
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Quartz, at 2.6 — the smallest value in that column.
2 From this table, write the number of moons Doran has, and the length of its day in hours.
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Doran has 7 moons and a day of 25 hours.
3 A sample weighs 1.2 kg. How many grams is that?
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1.2 × 1000 = 1200 grams.
Level 2 · Core
4 A passage states: "A gas is called heavy if its density is greater than 1.5." Using the table, how many of these gases are heavy?
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Y (2.3) and Z (3.1) are above 1.5, so 2. X is exactly 1.5, and the rule says greater than, so X does not count.
5 Three samples take 2 min, 90 s and 3 min. Write the shortest time in seconds, and the longest time in seconds.
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2 min = 120 s and 3 min = 180 s, so the shortest is 90 s and the longest is 180 s.
6 Using the mineral table, what is the hardness of the mineral whose density is 2.6?
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Density 2.6 is quartz, whose hardness is 7.
Level 3 · Challenge
7 A passage states: "A sample floats if its density is less than 1.0."1 Two samples float.
2 R floats.
3 A sample with density exactly 1.0 would float.
Which statements are correct?
2 R floats.
3 A sample with density exactly 1.0 would float.
Which statements are correct?
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P and R float, so two do (1 ✓, 2 ✓). But 1.0 is not less than 1.0, so such a sample would not float under this rule (3 ✗). 1 and 2.
8 Using the planet table, write the day length of the planet with the fewest moons, and the day length of the planet with the most moons, both in hours.
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Cressa has fewest moons (0) with a 9 hour day; Halim has most (14) with a 31 hour day.
9 Samples weigh 400 g, 1.2 kg and 950 g. What is their total mass in grams?
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400 + 1200 + 950 = 2550 grams.