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"Mixed Operations of Rational Numbers" PPT courseware
Discuss: Analyze several operations in this question, and explore and summarize on your own.
Calculate exponentiation first, then multiplication and division, and finally addition and subtraction. If there are parentheses, calculate what is inside the parentheses first.
game
Ask the students to take out the playing cards you prepared, and we will play a set of games. The name of this game is "24" points. The content of the game is to randomly select four cards from a deck of playing cards with the big and small kings removed, and perform a mixed operation based on the numbers on the cards. Each card can only be used once, so that the operation result is 24 or -24, where Red playing cards represent negative numbers, black playing cards represent positive numbers, J, Q, and K represent 11, 12, and 13 respectively. If we draw a spades 7, a spades 3, a club 3, and a club 7, we can Make them into 24 using 7× (3+3÷7). Let's give it a try, shall we?
I believe that the students must have mastered some skills through the previous sets of games. Then after class, you can play the "24-point" game with your companions to see who can calculate faster and more accurately.
summary:
1. Master the operation rules of mixed operations of rational numbers.
2. Use the laws of operations to simplify operations.
3. By playing games, we further deepened our understanding of the rules of mixed operations of rational numbers, accumulated computing skills, and improved computing speed.
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"Mixed Operations of Rational Numbers" PPT courseware 4:
"Mixed Operations of Rational Numbers" PPT Courseware 4 1. Rules for mixed operations of rational numbers: (1) Calculate exponentiation first, then multiplication and division, and finally addition and subtraction. (2) If there are parentheses, perform the operations in the parentheses first. Operations in parentheses: exponentiation, multiplication, division, addition and subtraction Summary: 1. have..
"Mixed Operations of Rational Numbers" PPT courseware 3:
"Mixed Operations of Rational Numbers" PPT Courseware 3 Mixed Operations of Rational Numbers Addition of the same sign takes the same sign absolute value addition of different signs takes the sign of the larger absolute value absolute value subtraction subtraction subtracting a number is equal to adding the opposite of the number multiplication Take the positive absolute value with the same sign..
"Mixed Operations of Rational Numbers" PPT courseware 2:
"Mixed Operations of Rational Numbers" PPT Courseware 2 Learning Objectives 1. Be able to correctly and skillfully perform mixed operations of addition, subtraction, multiplication, division and exponentiation of rational numbers according to the order of operations of rational numbers. 2. Be able to rationally use the laws of operations to simplify operations in operations. 3. Cultivate and improve positive...