Fractional multiplication and division is the core calculation content of sixth-grade mathematics, and it is also a mandatory test for the beginning of small promotion. This 100-question special exercise covers the multiplication of scores by all types, the process of attaching contracts, and the calculation of questions after proficiency does not lose points.
The calculation core of sixth grade mathematics is score: fractional multiplication, fractional division, and mixed operation. Many children “can calculate but are wrong”: the score is not exhausted, divided by a number is not changed, and the result forgets to write the shortest score. Solve this exercise one by one.
Core Rule
- Fractional multiplication: the numerator is multiplied by the numerator, the denominator is multiplied by the denominator, and the fractions can be
- Fractional division: dividing by a number equals multiplying by its reciprocal;
- The result must be the simplest fraction (numerator denominator mutual);
- The band score should be converted into a false score before calculation.
Approximate Skills
Reducing the number of minutes before calculation can greatly reduce the amount of calculation: for example, 2/3 × 3/4, about 3 first, becomes 2 × 1/4 = 1/2. Teaching your child to “split first and then multiply” is fast and not easy to get wrong.
Common Mistakes
① Fraction division forgets to take the reciprocal; ② the reduction is not complete, and the result can be rearranged; ③ the fraction is directly multiplied (the false fraction must be first); ④ the result denominator is 0 or “false fraction is not simplified” appears. 10 questions a day for two weeks, and the score was stable.
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