News
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The new stuff looks to me like they are teaching a lot of the tricks I picked up on my own to make math easier to do in my head. Mostly finding another number that is much easier to do the math on, like x * 49 is the same as x * 50 - x (which itself is x * 100 / 2 - x). Or sometimes if the actual problem is 296 * 973, seeing that that number will be something close to but less than 300,000 is good enough.