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Easy: Jumps of 1, middle labelled
First work out how much each jump is worth: find the difference between two labelled numbers and divide by the number of jumps between them. Then count on from the nearest labelled number to the dot, adding one jump for each tick.
Write the number shown by the dot.
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Take two labelled ticks, find the difference between their numbers, and divide by the number of jumps between them. From 0 to 50 in 5 jumps, each jump is 10.
Counting the tick marks instead of the jumps between them, which makes the answer one step off. Count spaces, not lines.
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