What is counting backwards from 100 by 7?

Counting backwards from 100 by 7 involves subtracting 7 each time from the previous number. The sequence of numbers would be:

100, 93, 86, 79, 72, 65, 58, 51, 44, 37, 30, 23, 16, 9, 2

This counting technique requires mental arithmetic and is often used as an exercise to improve numeracy skills and memory.