CALCULO MENTAL 5º

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5800 + 300 = 6100 8 + 3 = 11 2


4800 - 600 =4200

8-6=2 3


64 + 11 = 75 64 + (10+1) = 75 4


43 + 9 = 52 43 + (+10-1) = 52 5


43 + 19 = 62 43 + (+20-1) = 62 6


16 - 11 = 5 16 - (-10+1) = 5 7


46 - 21 = 25 76 - 31 = 45 8


16 - 9 = 7 16 - (-10+1) = 7

316 - 9 = 307 9


43 -1 9 = 24 83 -29 = 54 10


856 + 101 = 957 856 +100 +1 = 957 11


856 - 201 = 1057 856 - 301 = 1157 12


856 + 99 = 955 856 +(+100-1) = 955 13


856 + 199 =1055 456 + 299 = 755 14


856 + 101 = 957 856 +100 +1 = 957 15


856 + 201 = 1057

16


246 - 99 = 147 246 - (100+1) = 147 17


246 - 199 = 47 646 - 199 = 447 18


27 x 10 = 270 46 x 100 = 4600 65 x 1000 = 65000 19


2 x 60 = 120 6 x 200 = 1200 5 x 3000 = 15000 20


200 10 = 20 2 1=1 3000 10 = 300 21


200 100 = 2 2 1=1 3000 1000 = 3 22


60 20 = 3 400 200 = 2 16000 8000 = 2 23


198 + 37+2 =237 198 + 2 =237 200 + 37 =237 24


170 + 67+30 =267 170 + 30 =200 200 + 67 =267 25


40 x 600 =24000 4 x 6 =24 26


5 x 7 x 8 = 280 5 x 8 =40 40 x 7 =280 27


4,7 x 10 =47 4,7 x 100 =470 4,7 x 1000 =4700 28


234 10 = 23,4 476 100 = 4,76 6325 1000 = 6,325 29


20 2 = 10 2 1=1 246 2= 123 30


74 2 = 37 70 2 = 35 4 2= 2 35 + 2 = 37

31


840 20 = 42 840 10 = 84 84 2 = 42 32


46 x 5 =230 46 x 10 =460 460 2 = 230 33


46 x 50 =2300 46 x 100 =4600 460 2 = 2300 34


310 5 = 62 310 10 =31 31 x 2 = 62 35


1800 50 = 36 1800 100 =18 18 x 2 = 36 36


1/4 de 12 =3 12 4 =3 37


2/3 de 12 = 12 2 x 12 = 24 24 2 = 12 38


10% de 85 = 12 85 10 = 8,5 39


3% de 9 = 0,27 3 x 9 = 27 27 100 = 0,27 40


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