For example, teaching "addition and subtraction of fractions with different denominators"
Old knowledge is the addition and subtraction of fractions with the same denominator, and students can use the calculation rules to calculate correctly; Skills and methods of sharing points.
At first, students can calculate an addition and subtraction problem with the same denominator, mix a problem (1/8+3/8)+(5/6-1/6) and practice several common problems. Finally, a mixed operation problem is given: (1/8+3/8)+(5/6-1/6).
Students' calculus, single board game
( 1/8+3/8)+(5/6- 1/6)
=4/8+4/6
= 1/2+2/3 (student card is here)
Delete the above content, leaving 1/2+2/3, and add: Example 1 before it.
Example 1? 1/2+2/3
Students, we learned the addition and subtraction of fractions with the same denominator, and everyone learned it well. See if the questions on the blackboard are the final result. Can you find a way to continue to calculate their sum? ……
When introducing new courses, we should pay attention to the connection between old and new knowledge, guide students to use existing old knowledge, solve new problems, enlighten their thinking and cultivate their self-study ability.