mental arithmetic

1. (uncountable, usually)Synonym of mental calculation (“arithmetical calculations using only the human brain, with no help from any supplies (such as pencil and paper) or devices such as a calculator”).

1. Tom is very good at mental arithmetic.

   deTom ist sehr gut im Kopfrechnen. — Pfirsichbaeumchen

   CC BY 2.0 FR · Tatoeba · CK · B1Open on TatoebaReport a problem

2. Tom's very good at mental arithmetic.

   ruТом очень хорошо считает в уме. — Wezel

   deTom ist sehr gut im Kopfrechnen. — Pfirsichbaeumchen

   CC BY 2.0 FR · Tatoeba · patgfisher · B1Open on TatoebaReport a problem

3. Many mathematicians are bad at mental arithmetic.

   Багато математиків не вміють добре рахувати в голові. — deniko

   ruМногие математики плохо считают в уме. — Ooneykcall

   deIm Kopfrechnen sind viele Mathematiker schlecht. — Pfirsichbaeumchen

   CC BY 2.0 FR · Tatoeba · sundown · B1Open on TatoebaReport a problem

4. Tom was weak at mental arithmetic.

   deTom war schlecht im Kopfrechnen. — Pfirsichbaeumchen

   CC BY 2.0 FR · Tatoeba · voxbubnya · B1Open on TatoebaReport a problem

5. Tom did some quick mental arithmetic.

   ruТом быстренько посчитал в уме. — Wezel

   deTom rechnete im Kopf schnell nach. — Pfirsichbaeumchen

   CC BY 2.0 FR · Tatoeba · sundown · B1Open on TatoebaReport a problem

uncountable