The following set of QR code task cards have been created for upper level primary/elementary students. Grade 5/6 appropriate in Australia- however, I can not comment on any other correlation to International curriculum as I am not aware of their content.
The task cards ask students to multiply two-digit numbers by two digit numbers, as well as three digit numbers by one digit numbers.
The task cards ask students to complete long division, diving 5 digit dividends by two digit divisors. Students are also asked to solve smaller equations such as two digit dividends by one digit divisors.
Each QR code contains the answer for the equations so that students can self correct their work.
There are a large variety of free apps available for all platforms that allow QR codes to be read.