19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 take ...

For years, a French mathematician searched for a proof that a gigantic number is prime. His method is still used 150 years ...

A new collection of research papers examines how humans conceptualize numbers and the numeral systems we’ve build around them ...

Most of us have little trouble working out how many milliliters are in 2.4 liters of water (it's 2,400). But the same can't be said when we're asked how many minutes are in 2.4 hours (it's 144).

NARRATOR: Hello Snoot, I see you’re shopping. NARRATOR: Let’s see, you’ve got 5 eyeballs and 5 blobs. The eyeballs are 3 credits each and the blobs are 2 credits each. Add those 2 prices together. 3 ...

A simple finger trick for the 11 times table is helping secondary school students aged 12 to 16 improve mental arithmetic ...

A little-known strategy lets couples earn twice the rewards on the same grocery spending -- here's how it works.

Stage 5: Justify thinking. A vital habit that many students need to solidify is recontextualizing after they solve ...

For over a decade, mathematicians have failed to agree whether a 500-page proof is actually correct. Now, translating the ...

A visual puzzle challenges you to find two hidden numbers, 58 and 33, amidst a sea of 53s within 12 seconds. This exercise ...

“There’s an optimal strategy for winning multiple rounds of rock, paper, scissors: be as random and unpredictable as possible ...