Estimating by rounding
Use approximation through rounding to estimate answers and calculate possible resulting errors expressed using inequality notation a < x ≤ b; understand upper and lower bounds of rounded values
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“If a length is measured as 7 cm to the nearest cm, can your child say the actual length could be anywhere from 6.5 cm to 7.5 cm — understanding that rounding creates a range of possible values?”
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- Activity. Use approximation through rounding to estimate answers and calculate possible resulting errors expressed using inequality notation a < x ≤ b; understand upper and lower bounds of rounded values
What to notice. Estimate the answer to a calculation by rounding all values appropriately • Calculate upper and lower bounds of a rounded measurement • Express error intervals using inequality notation
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If a length is measured as 7 cm to the nearest cm, can your child say the actual length could be anywhere from 6.5 cm to 7.5 cm — understanding that rounding creates a range of possible values?
Use approximation through rounding to estimate answers and calculate possible resulting errors expressed using inequality notation a < x ≤ b; understand upper and lower bounds of rounded values
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Check understanding
- Estimate the answer to a calculation by rounding all values appropriately
- Calculate upper and lower bounds of a rounded measurement
- Express error intervals using inequality notation
“If a length is measured as 7 cm to the nearest cm, can your child say the actual length could be anywhere from 6.5 cm to 7.5 cm — understanding that rounding creates a range of possible values?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Number Representation & Place Value
- Age range
- Ages 12–14
Standards