Ábaco Japonés competencia decena 20 ejerc

Front

15, 52, 21, -13

Back

75

Front

99 - 36 + 25

Back

88

Front

55, 24, 10, -22

Back

67

Front

11, 22, 55, -12

Back

76

Front

Options: 13, 15, 51, -54. Correct answer:

Back

25

Front

7, 60, 11, 21

Back

99

Front

21, 57, -13, 24

Back

89

Front

99 - 44 + 22 + 12

Back

89

Front

2, 7, 90, -34

Back

65

Front

31, 55, 12, -22

Back

76