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)