yes and no. people should be able to know how to round. This is common sense, but some people still fail to do so, so this can be taken as a strategy.
Mental math is basically just giving an estimate of what the value will be, for example: 5x306= 5x3 and add 2 zeros will give you 1500 and the actual answer is 1530 so its kind of like rounding off to the nearest.
You can find plenty of math rounding worksheets online. Math rounding worksheets are best for practicing rounding numbers. here you will find plenty of math rounding worksheets to practice with and they are free so there is no need to buy a book. here is the link: www.homeschoolmath.net/worksheets/rounding.php
round or rounding
13.48 - 6.1 in mental math = 7.380000000000001
how to do mental math useing propertys
mental math is doing the math in your head or in your mind but not in a calculator or pencil and paper
90
Mental math is basically math in your head so for example 40x2=80 so I did that in my head
My math teacher started rounding in the third grade and it has followed me since. Another use might be, "They were just rounding the bend when he came into sight."
50 what's "mental math" supposed to mean? if it just means you did it in your head, then there is no difference between mental and regular math, except that it is harder to check your work.
math that is done in your head
Mental Math Mostly