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Cálculo mental C.R.A. Sexma de La Sierra Aplicamos la distributiva de la resta al cálculo mental 99 89 79 69 59 49 39 29 19 3 4 5 6 7 8 9 para multiplicar por 89 x 5 = ( -1) x 5 = - = 99 x 5 = (100-1) x 5 = 500 - 5 = 495 20 100x5 1x5 89 x 5 = (90-1) x 5 = 450 - 5 = 445 79 x 5 = ( - ) x 5 = - = 99 x 5 = (100-1) x 5 = 500 - 5 = 495 19 89 x 5 = (90-1) x 5 = 450 - 5 = 445 79 x 5 = (80-1) x 5 = 400 - 5 = 395 39 x 6 = ( - ) x 6 = - = 99 x 5 = (100-1) x 5 = 500 - 5 = 495 18 89 x 5 = (90-1) x 5 = 450 - 5 = 445 79 x 5 = (80-1) x 5 = 400 - 5 = 395 99 x 3 = ( - ) x 3 = - = 39 x 6 = (40-1) x 6 = 240 - 6 = 234 99 x 5 = (100-1) x 5 = 500 - 5 = 495 17 89 x 5 = (90-1) x 5 = 450 - 5 = 445 79 x 5 = (80-1) x 5 = 400 - 5 = 395 99 x 3 = (100-1) x 3 = 300 - 3 = 297 39 x 6 = (40-1) x 6 = 240 - 6 = 234 99 x 5 = (100-1) x 5 = 500 - 5 = 495 16 Aplica lo aprendido: = 49 x 5 69 x 9 = ( -1) x 9 = - = 99 x 8 = (100-1) x 8 = 800 - 8 = 792 15 100x8 1x8 69 x 9 = (70-1) x 9 = 630 - 9 = 621 39 x 7 = ( - ) x 7 = - = 99 x 8 = (100-1) x 8 = 800 - 8 = 792 14 69 x 9 = (70-1) x 9 = 630 - 9 = 621 39 x 7 = (40-1) x 7 = 280 - 7 = 273 59 x 8 = ( - ) x 8 = - = 99 x 8 = (100-1) x 8 = 800 - 8 = 792 13 69 x 9 = (70-1) x 9 = 630 - 9 = 621 39 x 7 = (40-1) x 7 = 280 - 7 = 273 99 x 6 = ( - ) x 6 = - = 59 x 8 = (60-1) x 8 = 480 - 8 = 472 99 x 8 = (100-1) x 8 = 800 - 8 = 792 12 69 x 9 = (70-1) x 9 = 630 - 9 = 621 39 x 7 = (40-1) x 7 = 280 - 7 = 273 99 x 6 = (100-1) x 6 = 600 - 6 = 594 59 x 8 = (60-1) x 8 = 480 - 8 = 472 99 x 8 = (100-1) x 8 = 800 - 8 = 792 11 Aplica lo aprendido: = 79 x 3 Aplica lo aprendido: = 90x6-6 = 89 x 6 10 Aplica lo aprendido: = 90x6-6 = 534 89 x 6 = 39 x 8 9 Aplica lo aprendido: = 90x6-6 = 534 89 x 6 = 40x8-8 = 312 39 x 8 = 59 x 7 8 Aplica lo aprendido: = 90x6-6 = 534 89 x 6 = 40x8-8 = 312 39 x 8 = 60x7-7 = 413 59 x 7 7 = 69 x 4 Aplica lo aprendido: = 90x6-6 = 534 89 x 6 = 40x8-8 = 312 39 x 8 = 60x7-7 = 413 59 x 7 6 = 70x4-4 = 276 69 x 4 = 99 x 6 Aplica lo aprendido: = 90x6-6 = 534 = 89 x 6 29 x 5 = 40x8-8 = 312 39 x 8 = 60x7-7 = 413 59 x 7 5 = 70x4-4 = 276 69 x 4 = 100x6-6 = 594 99 x 6 Aplica lo aprendido: = 90x6-6 = 30x5-5 = 534 = 145 89 x 6 29 x 5 = 40x8-8 = 312 = 39 x 8 79 x 9 = 60x7-7 = 413 59 x 7 4 = 70x4-4 = 276 69 x 4 = 100x6-6 = 594 99 x 6 Aplica lo aprendido: = 90x6-6 = 30x5-5 = 534 = 145 89 x 6 29 x 5 = 40x8-8 = 80x9-9 = 312 = 711 39 x 8 79 x 9 = 60x7-7 = 413 = 59 x 7 49 x 3 3 = 70x4-4 = 276 69 x 4 = 100x6-6 = 594 99 x 6 Aplica lo aprendido: = 90x6-6 = 30x5-5 = 534 = 145 89 x 6 29 x 5 = 40x8-8 = 80x9-9 = 312 = 711 39 x 8 79 x 9 = 60x7-7 = 50x3-3 = 413 = 147 59 x 7 49 x 3 2 = 70x4-4 = 276 = 69 x 4 89 x 7 = 100x6-6 = 594 99 x 6 Aplica lo aprendido: = 90x6-6 = 30x5-5 = 534 = 145 89 x 6 29 x 5 = 40x8-8 = 80x9-9 = 312 = 711 39 x 8 79 x 9 = 60x7-7 = 50x3-3 = 413 = 147 59 x 7 49 x 3 1 = 70x4-4 = 90x7-7 = 276 = 623 69 x 4 89 x 7 = 100x6-6 = 594 = 99 x 6 99 x 2 |