Learn Mental Math

Practical guides to mental math and the ideas behind Math Racer — fast two-digit addition, the times tables, and how competitive ELO ratings work.

• Mental Math Tricks for Two-Digit Addition

  Add two-digit numbers in your head without carrying: left-to-right addition, rounding-and-adjusting, and the bridge-to-the-next-ten method, with worked examples.

• How to Memorize the Times Tables Fast

  The smartest order to learn the multiplication facts, the patterns that erase the hard ones (nines trick, doubling, squares), and a spaced-repetition plan that sticks.

• Understanding ELO Ratings in Competitive Math

  What your math rating really means, why beating a stronger opponent is worth more, the K-factor, and how the ELO system finds your true skill over time.