Question

What is 94% of 260?

Answer 1

`244.4`.

Explanation:

Mental math:

Calculate `1%` of `260="   "2.6`

So `6%` of `260=6timescolor(blue)"2."color(magenta)6`
`"                       "=(6timescolor(blue)2)+(6timescolor(magenta)0.6)`
`"                       "=12+3.6`
`"                       "=15.6`

Then `94%` of `260` is the whole `260`, minus `6%` of it:

`94%times260=260-(6%times260)`
`"                    "=260-15.6`
`"                    "=244.4`

All without the need for a calculator!