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Are there any skills for simple math calculation in the second volume of the fourth grade?
These two questions may be that the child made a mistake when he took off the brackets. If there is a negative sign in front of the brackets, the negative sign in the brackets needs to be changed to a positive sign (that is, negative is positive).

833-297=833-(300-3)=833-300+3=536

298-(98-34)=298-98+34=234

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