Relative formula mass and relative atomic mass High School tarsia - starter, plenary or revision

This is a fun High School Chemistry tarsia for revision of calculating relative formula mass. There are 16 triangles with 18 pairs of questions and answers that make a parallelogram. I suggest that the A4 tarsia is printed on card and then the outline is cut out. Students can then quickly cut out the individual triangles. Included are the following topics: relative atomic mass of atoms and isotopes (isotopes are limited to isotopes of oxygen and hydrogen) and relative formula mass of different compounds. The 'fjsw' file can be opened and modified with tarsia software. The software is free to download but there is not currently a version for Mac computers.