Connect equivalent values of mass in kilogram and tonne units with this hands-on activity for the upper years.   Students will cut out and assemble the decryptor device to then add in the matching missing values within the cut out squares.   There are also four values that need to be completed by solving the line maze on the side of the base page.   Two versions are included for additional practise for your students. Both versions can use the same decryptor page.   Each student will need a split pin for to assemble this template. For best results, print on thick card.