| 11. | The reason why mental arithmetic is difficult has nothing to do with a limited brain capacity.
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| 12. | Currently, basic and advanced courses in abacus and mental arithmetic are available at private learning centres nationwide.
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| 13. | Apply an appropriate method for computing from among mental arithmetic, paper pencil computations, calculators, and computer models.
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| 14. | In grade schools, students are sometimes taught the method of complements as a shortcut useful in mental arithmetic.
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| 15. | While he examined my treasures _ polite or interested, I couldn't tell _ I did some mental arithmetic.
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| 16. | When Murray became the youngest millionaire in rodeo history at 23, a fellow rider did some mental arithmetic.
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| 17. | During Sunday's contest, each student took part in a 10-minute mental arithmetic test before the 20-minute sempoa contest.
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| 18. | Mental arithmetic was found to be ineffective by at least one study, especially in students counting backward by seven.
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| 19. | Mental arithmetic was first introduced in Indonesia at the end of 1995 due to its popularity in the region.
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| 20. | :So clearly, going to either extreme is bad-a happy medium for mental arithmetic is somewhere between 2 and 60.
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