Starter quiz
- What is a conjecture?
- A mathematical statement that is thought to be false and has been proven false
- A mathematical statement that is thought to be true and has been proven true
- A mathematical statement that is thought to be false and has not yet been proven
- A mathematical statement that is thought to be true and has not yet been proven ✓
-
- Select the numbers that round to 23 000 when rounded to the nearest thousand.
- 22 475
- 22 975 ✓
- 23 175 ✓
- 23 475 ✓
- 23 675
-
- 134 578 is 135 000 to the nearest ...
- ten
- hundred
- thousand ✓
- ten thousand
- hundred thousand
-
- Laura estimates how many cars are in a car park. Which of the following is the most appropriate degree of accuracy in this situation?
- Nearest integer
- Nearest ten
- Nearest hundred ✓
- Nearest thousand
- Nearest ten thousand
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- A charity is sending thank you cards to 110 people who have made donations. Stamps come in books of 12. How many books of stamps do they need to buy?
- '10' ✓
- Izzy buys a large bag of 50 chocolate bars. She puts them into boxes of 4 to sell for charity. How many boxes will Izzy have to sell?
- '12' ✓
Exit quiz
- 1.643 is 1.6 to one ______ place.
- 'decimal' ✓
- The midpoint of 2.2 and 2.3 is ______.
- '2.25' ✓
- The midpoint of 2.268 and 2.269 is ______.
- '2.2685' ✓
- Round 14.5682 to 3 decimal places.
- '14.568' ✓
- Round 0.0459 to three decimal places.
- '0.046' ✓
- Round 172.0998 to three decimal places.
- '172.100' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Numbers with any number of decimal places can be represented on a number line.
- Rounding is useful to estimate numbers to a degree of accuracy.
- Numbers can be rounded to 3 decimal places.
- Knowing a number has been rounded means you can give examples of what the unrounded number might have been.
Common misconception
Errors when a zero is required when rounding. E.g 5.99 rounds to 6 to 1 d.p.
Embedding that 6 and 6.0 may be written like that to convey the accuracy they've been rounded to. To show that 5.99 has been rounded to 1 d.p. we write it as 6.0 not 6.
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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