Diverging offtopic, why the hell is Britain still using the stone as a unit of weight? That shit is base-14. Ain't nobody got time for that.
The international paper size standard, ISO 216, is based on the German DIN 476 standard for paper sizes. ISO paper sizes are all based on a single aspect ratio of square root of 2, or approximately 1:1.4142.
63•78 = 60•81 + 3•18
= 4860 + 54
63•78 = 70•71 - 7•8
= 4970 - 56
63•78 = 41•100 + 22•37
= 4100 + 740 + 74
It involves the old english standard of the dozen. How many dozens of donuts do I need to feed twenty people if each person eats three? ?
How many dozens of eggs do I need if I need to bake thirty cakes that need 3 eggs each
12 is better than 10 for a LOT of operations. Having roots of by 2, 3, 4 and 6 help show all sorts of the ways numbers interconnect to a young mind.
Here's a quick trick. What's 65 squared? C'mon, what's 65 times 65?
Do this. Take the digits before the last 5. In this case, that means 6. Multiply by the number one greater; in this case, that means 7. Now, 6 times 7 is 42. Then just tack on a 25 at the end.
That is, 65 times 65 is 4225.
So what is 253?
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