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We wrote the numbers from the question on the metre line marks to make it easier to see and remember. We also used a ruler to align the mouths of the animals with the closest marking. We were then able to count the difference using the marks like a number line. We found these answers:
1. The seagull is 4m above sea level
2. The crab is 9m below sea level (or -9)
3 The shrimp is 2m lower than the shark
4. The eel is 7m below the surface (or -7m)
5. We thought this was the same as question 1, so it is 4m.
6. The seagull's beak is 7m higher than the seahorse's mouth.