This worksheet introduces a novel 'numeric language' using 'reverse notation'. The digits 6, 7, 8 and 9 are banned. The allowed digits may be written in reverse (mirror image). Students should be given time to explore the given examples to see if they can discover the method. Four graded tasks are given.
There is a detailed teacher's guide along with the answers to the tasks.
Students love this activity!
[Number bases, decimal system, place value, number puzzle, reflection]