Cálculo oral en el segundo volumen de sexto grado de primaria
1,3/7 × 49/9 - 4/3
2,8/9 × 15/36 + 1/27
3,12× 5/6 – 2/9 ×3
4,8× 5/4 + 1/4
5,6÷ 3/8 – 3/8 ÷6
6,4/7 × 5/9 + 3/7 × 5/9
7,5/2 -( 3/2 + 4/5 )
8,7/8 + ( 1/8 + 1/9 )
9,9 × 5/6 + 5/6
10,3/4 × 8/9 - 1/3
11,7 × 5/49 + 3/14
12,6 ×( 1/2 + 2/3 )
13,8 × 4/5 + 8 × 11/5
14,31 × 5/6 – 5/6
15.9/7 - ( 2/7 – 10/21 )
16.5/9 × 18 – 14 × 2/7
17.4/5 × 25/16 + 2/ 3 × 3/4
18,14 × 8/7 – 5/6 × 12/15
19,17/32 – 3/4 × 9/24
20,3 × 2/9 + 1/3
21,5/7 × 3/25 + 3/7
22,3/14 ×× 2/3 + 1/6
23,1/5 × 2/3 + 5/6
24,9/22 + 1/11 ÷ 1/2
25,5/3 × 11/5 + 4 /3
26,45 × 2/3 + 1/3 × 15
27,7/19 + 12/19 × 5/6
28,1/4 + 3 /4 ÷ 2/3
29,8/7 × 21/16 + 1/2
30,101 × 1/5 – 1/5 × 21