"Mixed Operations of Rational Numbers" PPT Courseware 2

Description

"Mixed Operations of Rational Numbers" PPT Courseware 2

learning target

1. Be able to correctly and skillfully perform the 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 correct and rapid computing skills.

Mixed order of operations for rational numbers:

⑴First multiply , then multiply and divide , and finally add and subtract ;

⑵Same-level operations are performed from left to right;

⑶ If there are parentheses, do the operations in the parentheses first, and proceed in the order of parentheses, square brackets, and braces.

Review and summary

What did you learn in this lesson? ? ?

(1) The order of mixed operations of rational numbers;

(2) Reasonable use of arithmetic rules and arithmetic laws; arithmetic rules are the basis for solving problems, and the guarantee for improving the efficiency of problem solving is the rational application of arithmetic laws. Pay special attention to the fact that only addition and multiplication have arithmetic laws.

game

The name of the game is called "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?

Thinking: According to the above rules, use the four rational numbers 3, 4, -6 and 10 to write three different calculation formulas so that the result is 24.

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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:

Discuss the "Mixed Operations of Rational Numbers" PPT courseware: Analyze several operations in this question and explore and summarize by yourself. Calculate exponentiation first, then multiplication and division, and finally addition and subtraction. If there are parentheses, calculate the ones inside the parentheses first. . Game: Ask students to take out the poker cards you have prepared..

File Info

Update Time: 2024-11-21

This template belongs to Mathematics courseware Qingdao Edition Seventh Grade Mathematics Volume 1 industry PPT template

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