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Урок 4

Урок 4. Приемы быстрого счета. Прибавь и вычти!. (a + n) + (b - n)=. а + b = c. с. = a + n + b - n=. 4654 + 998. = ( 4654 -2) + ( 998 +2) =. = 465 2 + 1000. = 5 65 2. Прибавь или вычти!. (a + n) - (b + n)=. а – b = c. = a + n - b - n=. с. 4654 – 998.

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Урок 4

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  1. Урок 4 Приемы быстрого счета

  2. Прибавь и вычти! (a+n) + (b - n)= а + b=c с = a+n + b - n= 4654 + 998 = (4654 -2) +(998+2) = = 4652+1000 = 5652

  3. Прибавь или вычти! (a+n) - (b + n)= а –b=c = a+n - b - n= с 4654 – 998 = (4654 + 2) -(998+2) = = 4656-1000 = 3656

  4. Прибавим и вычтем 847 + 999 = Прибавим или вычтем при вычитании. 4654 – 998 = 345 -103 =

  5. Повторим 1.Выполнить сложение чисел на числовой прямой: 2.Выполнитьсложение: -562 - 745

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