The strategy of mixed fraction operation in the sixth grade of Mathematics The easiest and infallible way Do the math
Addition and subtraction: all points
Multiply: approximately
Divide by: multiply by reciprocal
Ratio size: for example, the ratio of a / B and C / D is calculated as AD, bc.ad If it is large, then a / B is large; if BC is large, then C / D is large. If it is equal, then it is equal