CALCULO MENTAL 2º

Page 1

1


10 + 30 = 40 1 + 3 = 40 2


15 + 30 = 45 1 + 3 = 45 3


45 + 30 = 15 4 + 3 = 15 4


30 + 10 = 20 3 + 1 = 20 5


100 + 7 = 107 107 6


100 + 30 = 130 130 7


156 + 3 = 159 150 +(6+ 3) = 159 8


156 + 20 = 176 100 + (50 +20) = 176

156 +(5+ 2) = 176 9


156 - 3 = 153 150 +(6+ 3) = 153 10


156 - 20 = 136 100 + (50 -20) = 136

156 +(5 - 2) = 136 11


2 + 2+ 2 +2= 8 3 + 3+ 3 = 9 12


100 - 3 = 97 100 - 5 = 95 13


256 + 2 = 258 200 + (6 +2) = 258 14


256 + 20= 276 200 + (50 +20) = 276 15


2x3=6 4 x 5 = 20 16


10 + 30 + 7 = 47 1+3=4 17


10 + 30 + 57 = 97 1 + 3 + 5= 9 18


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.