Here is a number line for a sponsored walk. The start is 0 metres and the far end is 1,000 metres. Only three marks are on it: 0 at the start, 500 in the middle, and 1,000 at the finish.
Roughly where would 750 metres go, past the middle towards the finish?
Three number lines appear one at a time, each with a marker resting on it. Look at where each marker sits and think about which mark you already know that helps you judge its place. A landmark is a mark we know, like the middle, that we use to place other numbers.
In your maths copy, draw a number line from 0 to 1,000 and mark it in hundreds: 0, 100, 200, all the way to 1,000.
Then mark these three numbers in roughly the right place on your line:
For each one, whisper to yourself which landmark helped you decide where it goes.
Today we place four numbers together on the same line, which runs from 0 to 1,000. Each time, we say which landmark we used before we drop the marker. We start with 300, then 750, then 480, and finally 920. Each one leans on a landmark, so predict where the marker will land before we check it.
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