Para los niños les dejo estos ejercicios para que refuercen lo aprendido.
9 +__ = 13, 19 -__= 13, 9 x__= 36, 9+__= 15, 19-_= 12, __x8= 72,
19+2= __, __+9= 18, __+ 4= 12, 18 -__= 12, __x 8= 40, 8+__= 14,
__-7= 21, 8x__= 64, 18+9= __, 8+__ = 10, 7 +__= 11, 17-__= 13,
7 x__= 56, __+6= 13, __-7= 10, 7x__= 42, 17+2= __, __+9= 16,
__+ 4= 10, 16 -__= 11, __x 3= 24, 6+__= 12, 16-_=9, __x8= 48,
16+9= __, 6+__ = 8, __+ 4= 9, 15 -__= 9, 9 x_= 18, __+6= 11,
25-_= 18, 5x__= 35, 15+2= __, __+9= 14, _ + 4= 8, 14 -__= 8,
__x 5= 30, 4+__= 10, __-7= 33, __x8= 32, 14+9= __, __+ 2= 6,
_+ 4=_7, 13 -__= 10, 3 x__= 27, 3+__=9, __-7=6, 6 x__= 54,
13+2= __, __+9= 12, 2 +_= _6, 12 -__=6, __x 5= 50, __+6=8,
__-7= 13, 7x__= 28, 12+9= __, __+ 2= 14
9 +__ = 13, 19 -__= 13, 9 x__= 36, 9+__= 15, 19-_= 12, __x8= 72,
19+2= __, __+9= 18, __+ 4= 12, 18 -__= 12, __x 8= 40, 8+__= 14,
__-7= 21, 8x__= 64, 18+9= __, 8+__ = 10, 7 +__= 11, 17-__= 13,
7 x__= 56, __+6= 13, __-7= 10, 7x__= 42, 17+2= __, __+9= 16,
__+ 4= 10, 16 -__= 11, __x 3= 24, 6+__= 12, 16-_=9, __x8= 48,
16+9= __, 6+__ = 8, __+ 4= 9, 15 -__= 9, 9 x_= 18, __+6= 11,
25-_= 18, 5x__= 35, 15+2= __, __+9= 14, _ + 4= 8, 14 -__= 8,
__x 5= 30, 4+__= 10, __-7= 33, __x8= 32, 14+9= __, __+ 2= 6,
_+ 4=_7, 13 -__= 10, 3 x__= 27, 3+__=9, __-7=6, 6 x__= 54,
13+2= __, __+9= 12, 2 +_= _6, 12 -__=6, __x 5= 50, __+6=8,
__-7= 13, 7x__= 28, 12+9= __, __+ 2= 14
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