37 - The Math Puzzle › Getting faster at mental math
Getting faster at mental math
If arithmetic feels slower than it used to, you have not forgotten how it works. You have just stopped doing it, because the calculator does it for you. Speed comes back with reps, and the reps do not need to take long.
1. Estimate before you calculate
Before reaching for a calculator, guess. Round everything, get a rough answer, then check. This builds the sanity-check instinct that catches a misplaced decimal point before it reaches a spreadsheet.
2. Break numbers apart
47 + 38 is hard. 47 + 40 - 2 is easy. Most fast mental arithmetic is not raw computation, it is rearranging into something more convenient.
3. Learn a couple of shortcuts properly
Multiplying by 5? Halve it and multiply by 10. Multiplying by 9? Multiply by 10 and subtract one copy. Two or three of these, used constantly, beat twenty you half-remember.
4. Put a small amount of time pressure on it
Untimed practice builds accuracy. A clock builds speed. You want both, and the clock is the part most people skip.
5. Make it daily and make it short
Five minutes a day beats an hour on Sunday. This is where 37 - The Math Puzzle fits: seven dice, one target, a few minutes. Solo Blitz rounds run from one minute to ten, so a session fits inside a coffee queue or a compile.
An honest note
Practising arithmetic makes you faster at arithmetic. It will not make you better at unrelated things, and we are not going to pretend otherwise. The research on brain training transferring to general cognitive ability is weak, and the US Federal Trade Commission has previously penalised a major brain-training company for claiming more than it could support. What we will say is that being quick with numbers is useful on its own, and that getting there can be fun.