CALCULO MENTAL - SEXTO GRADO.

1.- 25 X 4 + 15 =

• 125

• 115

• 151

• 521

2.- 23 X 1000 =

• 22000

• 23000

• 2300

• 32000

3.- 2750 - 750 =

• 22000

• 2000

• 21000

• 2001

4.- 8.75 + 0.25 =

• 8

• 9

• 10

• 9.5

5.- La mitad de 4.6 =

• 2.2

• 2.3

• 2.4

• 2.1

6.- 800 entre 20 =

• 35

• 40

• 41

• 42

1/2 +1/4 =

• 3/4=9/18 =

• 3/4 = 6/8

• 3/6 = 3/2

• 8/6 = 1/4

1 / 3 + 1/ 6=

• 2 / 3 =5/7 =

• 3/6 = 9/ 18

• 3/ 7 = 2/ 2

• 9/9= 4/8

1/2 -1/8 =

• 3/5=3/6

• 3/8=6/16

• 5/8=4/8

• 3/7= 4/6

1/2 x 2/3 =

• 1/2 = 1/6

• 1/3 = 2/6

• 2/3=2/5

• 5/6 = 6/8