Error Intervals & Bounds Calculations Lesson

Ever written an answer down and lost marks because you didn't spot it needed rounding — or forgotten what an error interval actually is? This lesson clears it up for good.

We cover everything from rounding to significant figures, right through to error intervals, upper and lower bounds, and how to use bounds in calculations (including the trickier ones involving division, where the max/min logic catches so many students out).

What's included:

• Worked examples — step-by-step, showing exactly how to set out bounds calculations for full marks

• Pause-and-try questions — built into the video so you can stop, have a go yourself, then check your working before moving on

• Exam-style questions — the kind that come up again and again, with the exact wording and command words to look out for

As an examiner, this is one of those topics I see costing students marks every single series — usually not because they don't understand it, but because of one small slip in how they write the interval down. This lesson is built to stop that happening to you.