A lamp and a bulb together cost £32.
The lamp costs £30 more than the bulb.
How much does the bulb cost?
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This activity is suitable for students of mathematics all around the world. Use the button below to change the currency symbol used to make it more relevant to your students. You may wish to choose an unfamiliar currency to extend your students' experience.
Do you think the answer is £2?
If that is the case, the lamp must cost £30 more than that which is £32.
That means the total cost would be £34... wrong,
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Here's another simple question that, for many people, does not have the intuitive answer.
In the final seconds of the marathon you overtake the person in second place. In what position do you finish?
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments:
However it would be better to assign one of the student interactive activities below.
Here is the URL which will take them to a related student activity.