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2. Mental calculation - Wikipedia

   en.wikipedia.org/wiki/Mental_calculation

   Since 9 = 10 − 1, to multiply a number by nine, multiply it by 10 and then subtract the original number from the result. For example, 9 × 27 = 270 − 27 = 243. This method can be adjusted to multiply by eight instead of nine, by doubling the number being subtracted; 8 × 27 = 270 − (2×27) = 270 − 54 = 216.

3. Mental abacus - Wikipedia

   en.wikipedia.org/wiki/Mental_abacus

   Mental calculation is said to improve mental capability, increases speed of response, memory power, and concentration power. Many veteran and prolific abacus users in China, Japan, South Korea, and others who use the abacus daily, naturally tend to not use the abacus any more, but perform calculations by visualizing the abacus.

4. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Cite this page; Get shortened URL; Download QR code; Print/export ... 11=10+1. Thus, = (+) = + ... There are many other methods of calculation in mental mathematics ...

5. Mental calculator - Wikipedia

   en.wikipedia.org/wiki/Mental_calculator

   A mental calculator or human calculator is a person with a prodigious ability in some area of mental calculation (such as adding, subtracting, multiplying or dividing large numbers). In 2005, a group of researchers led by Michael W. O'Boyle, an American psychologist previously working in Australia and now at Texas Tech University , has used MRI ...

6. Everyday Mathematics - Wikipedia

   en.wikipedia.org/wiki/Everyday_Mathematics

   Mental Math and Reflexes—These are brief (no longer than 5 min) sessions “…designed to strengthen children's number sense and to review and advance essential basic skills…” (Program Components 2003). Math Boxes—These are pages intended to have students routinely practice problems independently. Home Links—Everyday homework is sent ...

7. Grid method multiplication - Wikipedia

   en.wikipedia.org/wiki/Grid_method_multiplication

   Because it is often taught in mathematics education at the level of primary school or elementary school, this algorithm is sometimes called the grammar school method. [ 1 ] Compared to traditional long multiplication , the grid method differs in clearly breaking the multiplication and addition into two steps, and in being less dependent on ...