Task: Review exercise of a bit mixed grade, percentage

Review content: Mark, percentage takes division exercise (3 kinds)

Review a purpose: Make the student can understand the immanent connection that masters mark and percentage exercise and solution subject method, solve a bit mixed grade and percentage exercise adroitly.

Review a focal point: The respective characteristic of 3 kinds of exercises and solution inscribe train of thought and analytic method.

Education process:

One, the respective characteristic that arranges 3 kinds of exercises respectively and method of the train of thought that solve a problem and analysis:

1, seeking a number is another number a few (hundred) :

Capture a problem to undertake an analysis, find out be measured quite and " 1 " quantity

Measure ÷ quite " 1 " quantity

2, seek a number a few (hundred) how much be:

Hold the key that contains minute of rate sentence analysis, find out " 1 " quantity

"1 " the corresponding cent of the problem that measure × leads = issue

3, foregone of a number a few (hundred) how much be, seek this number:

Hold the key that contains minute of rate sentence analysis, find out " 1 " quantity

The corresponding cent of known quantity of known quantity ÷ leads = " 1 " quantity

The 2nd, the analytic measure of 3 kinds of exercises:

Search: Hold the key that contains minute of rate sentence analysis, find out " 1 " quantity

2 sentence: Judge " 1 " two it is foregone sealed still, use multiplication foregonely to beg a question, use division sealedly to beg " 1 " quantity

3 correspondence: The corresponding relationship that should seek exact amount and cent rate (difficult but line segment of have the aid of pursues)