Mathematics·Number Representation & Place Value·procedural
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
Suggested ages 12–14
Evidence of 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
Assessment prompt
If a length is measured as 7 cm to the nearest cm, can Estimating by rounding say the actual length could be anywhere from 6.5 cm to 7.5 cm — understanding that rounding creates a range of possible values?
Standards alignment
KS3.Maths.Num.14GB · uk-nc-2013
Approximation and Estimation
The national curriculum in England: Key stages 1 and 2 framework document · Key Stage 3