Reason I'm asking is I supplement my dd's maths (school here in Germany - everything metric) with maths books written in English. These are American and teach both metric and standard measurements.
Are these still relevant outside the US? For example, the book deals with cm/metres but also inches, feet, yards, miles. They measure volume in cup, pints, quarts, gallons. For weight the book uses ounces, pounds etc.
There are questions there like "How many ounces are there in a pound?" (I'm old enough to know so it isn't a big deal for me to teach it).
Is this still taught in the UK though or should I be skipping this chapter and sticking to metrics?