Oops, don't scroll down too far at first! .. haha .. the trick for the first one is that the two on the 20 HAVE to be 9 and 8 for that sum with 3 to get to 20 .. it's easy after seeing that .. your link .. https://www.theguardian.com/science/2017/may/22/did-you-solve-it-the-maths-problem-for-5-year-olds-stumping-the-web Oops, spoiled it .. :) .. one lesson is to go for a bigger picture first. Thanks .. those will be fun for the little ones i coach on the odd Sunday .. neat .. i'll send them the link!