Which equals 29^2 x .01
=> ((28 x 30) +1) X .01
=> (840 + 1) x .01
=> 8.41
28 x 30 is an easy mental calculation, as is adding 1, as is moving the decimal place over 2 places. I am teaching this to 4th graders, in two weeks. % to decimal is next week. They can square 2-digit numbers in their heads, already.
Reminds me of boxed software, too. You check the compatibility, the features that included one must-have new feature. Buy it and discover what vaporware is. It started me on the ethics of pirating, finding out if it actually works, and then, and only then, buying a real copy. I donate to developers on Linux, now.
And Bandcamp.
It sounds harder than it was. Our furnace was on its last leg, huge, loud, and inefficient. We made sure that our replacement could handle a heavier load that a HEPA filter would add when we bought it. The second HEPA air exchange filter was an off the shelf unit, put in the room that our immunosuppressed relative worked from. We have allergies, (not serious, but uncomfortable at certain seasons) so the HEPA upgrade seemed to just make sense. Because the new furnace was smaller, making room for a thicker filter was easy. It was an easy swap. Our heating bills went down, so the payback is relatively short.
We provided home-schooling for two and had an immune suppressed person at our home. I added a HEPA air exchange filtration system and upgraded our furnace/AC for a second HEPA filter in our home. Now, the children are back in school, and their dad is back to the office. We are teaching at school, but remain Covid free. We had our most recent shot on Thursday. We know of more infected people this year in our circle this past two months, than the entire time before, so we are hoping for the best.
To force people to spend more time shopping. More time means more chance for impulse buying and better sales. Basic marketing.
,25/,5 x 100/100 = 25/50 = 1/2
Why was that hard?
100/100 = 1, because any number divided by itself is 1.
And any number multiplied by 1 is still that number.
TBH, I moved the decimal over 2 places on the numerator and denominator and simplified 25/50 to 1/2 because It is easier to do in my head. Some of the other paths are too complicated when I am going to sleep.