zequals

Etymology
Coined in 2013 by English author, from. Eastaway wrote that "the Z is for Zeroes, and also for the ZigZagness of the symbol".

Noun

 * 1)  A technique for simplifying mental approximations by reducing each number to one significant figure followed by zeroes.
 * 2) * 2016, Rob Eastaway, ‎Mike Askew, Maths on the Go: 101 Fun Ways to Play with Maths (page 31)
 * Zequals is a fun way of ruthlessly rounding numbers so that every number you deal with becomes simple. Using Zequals, whenever you encounter a number, you immediately round it to a single digit followed by zeroes (if it's bigger than ten).

Verb

 * 1)  Is equal to, after performing such a reduction.
 * 2) * 2016, Rob Eastaway, ‎Mike Askew, Maths on the Go: 101 Fun Ways to Play with Maths (page 31)
 * Using Zequals, whenever you encounter a number, you immediately round it to a single digit followed by zeroes (if it's bigger than ten). So for example: 18 zequals 20. 142 zequals 100. 2.3 zequals 2.