Starter quiz
- 1.643 is 1.6 to one decimal ______.
- 'place' ✓
- The midpoint of 6.1 and 6.2 is ______.
- '6.15' ✓
- The midpoint of 6.104 and 6.105 is ______.
- '6.1045' ✓
- Round 104.5684 to 3 decimal places.
- '104.568' ✓
- Round 0.0569 to three decimal places.
- '0.057' ✓
- Round 203.0995 to three decimal places.
- '203.100' ✓
Exit quiz
- If a degree of accuracy is not stated in a question that you are answering, you should use the ______ degree of accuracy as the values in the question.
- 'same' ✓
- Round 5.072 to two decimal places.
- '5.07' ✓
- Round 34.072 to one decimal place.
- '34.1' ✓
- Round 135.98 to one decimal place.
- '136.0' ✓
Calculate the cost of carpeting this area.- '£69.72' ✓
- 3 friends go out for lunch and spend £28. They pay the same amount each. What is the smallest amount they each pay to cover the cost of the bill?
- '£9.34' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- Numbers with any number of decimal places can be represented on a number line.
- Any number can be rounded to a given number of decimal places.
- It is possible to identify the most suitable number of decimal places from the context.
- It can be useful to think about what the biggest and smallest values of a number rounded in context were.
Common misconception
Pupils think that repeated rounding gives the correct answer.
Use a number line to support pupils’ understanding. Locate the number to be rounded on the line and identify the critical values.
Keywords
Round - To change a number into another number that is approximately the same value but is easier to work with. E.g. round 561 to the nearest 10 is 560.
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