I was looking at a question similar to the one below

I started thinking about the responses that my class had given;

Some found that Ades amount couldn’t be £15 (£10 × 1.5 = £15 and then £10 and £15 didn’t make £35)

Some used the fact ‘1.5 times more’ to show that amounts were £14 and £21

Some used the fact that if Bella had £10 and Ade had £10 × 1.5 = £15 then the total was incorrect. I started thinking about what pupils would do to ‘fix’ the error. What if the total amount was wrong? What if the ‘1.5’ was wrong? What if Bella’s amount was wrong?