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2. Mental calculation - Wikipedia

   en.wikipedia.org/wiki/Mental_calculation

   The products of small numbers may be calculated by using the squares of integers; for example, to calculate 13 × 17, one can remark 15 is the mean of the two factors, and think of it as (15 − 2) × (15 + 2), i.e. 15 2 − 2 2.

3. Number Sense (UIL) - Wikipedia

   en.wikipedia.org/wiki/Number_Sense_(UIL)

   Since Number Sense is designed to test students' mental math abilities, no calculators or scratch paper can be used during competition. In order for a question to be scored as correct the exact answer must be given (no allowance for rounding), except where the question is preceded by an asterisk, in which case for the question to be scored as ...

4. Worksheet - Wikipedia

   en.wikipedia.org/wiki/Worksheet

   The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

5. Cognitive acceleration - Wikipedia

   en.wikipedia.org/wiki/Cognitive_acceleration

   Thinking Maths: The curriculum materials of the Cognitive Acceleration through Mathematics Education (CAME) project - Teacher's Guide. London: CAME Project/King's College. Adhami, M., Robertson, A., & Shayer, M.(2004). Let's Think Through Maths!: Developing thinking in mathematics with five and six-year-olds. London: nferNelson

6. 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 ...

7. Exercise (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Exercise_(mathematics)

   J. C. Maxwell explained how exercise facilitates access to the language of mathematics: [6] As mathematicians we perform certain mental operations on the symbols of number or quantity, and, proceeding step by step from more simple to more complex operations, we are enabled to express the same thing in many different forms.