Notes and Guidance
Children are introduced to imperial units of measure for the first time. They understand and use approximate equivalences between metric units and common imperial units such as inches, pounds (lbs) and pints. Using the measurements in the classroom, such as with rulers, pint bottles, weights and so forth, helps children to get an understanding of the conversions. 1 kg is sometimes seen as approximating to 2.2 lbs.
What do we still measure in inches? Pounds? Pints?
Why do you think we still use these imperial measures?
What does approximate mean?
Why do we not use the equals (=) sign with approximations?
How precise should approximation be?