Crack The Safe - Decimals (Calculations, Equivalence, Recurring)

Three “Crack The Safe” activities on decimals (stuff related to decimals). There is one on calculating with decimals, one on equivalent fractions, decimals and percentages and one on recurring decimals. These contain six questions but ten possible answers (bar the equivalence worksheet) meaning that students can self-check their answers (are they in the list of possible answers?) whilst the teacher can help those who require it. I use these as starters and plenaries but that is obviously up to you.