"Mixed Operations of Rational Numbers" Rational numbers and their operations PPT download

Description

"Mixed Operations of Rational Numbers" Rational numbers and their operations PPT download

Part One: Learning Objectives

1. Master the rules of mixed operations of rational numbers, and be able to skillfully perform mixed operations of addition, subtraction, multiplication, division and exponentiation of rational numbers. (Key points)

2. Be able to rationally use operational laws to simplify operations during the operation process. (Difficulty)

Mixed operations of rational numbers PPT, part 2: introducing new lessons

Review introduction

What operations have we learned so far? Please give some examples.

Addition, subtraction, multiplication, division, exponentiation.

Randomly select 4 cards from a deck of playing cards (excluding the big and small kings), and perform a mixed operation based on the numbers on the cards (each card can only be used once), so that the result of the operation is 24 or -24. Among them, the red playing cards represents negative numbers, black playing cards represent positive numbers, J, Q, and K represent 11, 12, and 13 respectively.

Mixed operations of rational numbers PPT, part 3: teaching new courses

Mixed operations on rational numbers

collaborative inquiry

1. Contains only a certain level of operations

Example 1 Calculation

1) -2+5-8

2) -100÷25×(-4)

2. Mixing of different levels of operations

Example 2 Calculation

14-14÷(-2)+7×(-3)

=14-(-7)+(-21)=21-21=0

—From high-level to low-level operations

Calculate multiplication and division at level two first; then calculate addition and subtraction at level one.

3. Operations with parentheses

Example 3 Calculation

-3-{［-4+ (1-1.6×5/8)] ÷(-2)}÷2

In conclusion

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.

Blackjack game

24 point game rules:

" Randomly select 4 cards from a deck of playing cards (excluding the big and small kings), and perform a mixed operation based on the numbers on the cards (each card can only be used once), so that the result of the operation is 24 or -24. Among them, the red poker The cards represent negative numbers, the black playing cards represent positive numbers, and J, Q, and K represent 11, 12, and 13" respectively.

Mixed operations of rational numbers PPT, part 4: practice in class

1. Which of the following calculations is correct ( )

2. Follow the steps shown in the figure below. If the input value is -2, the output value is ______.

3. Calculate:

4. Please read the following materials carefully and calculate:

Mixed operations of rational numbers PPT, Part 5: Class summary

Mixed operations on rational numbers

order of operations

Simple calculation

Blackjack game

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For more information about the PPT courseware "Rational Numbers and Their Operations and Mixed Operations of Rational Numbers", please click on the Rational Numbers and Their Operations PPT Mixed Operations of Rational Numbers PPT tag.

"Mixed Operations of Rational Numbers" Rational numbers and their operations PPT teaching courseware:

"Mixed Operations of Rational Numbers" Rational Numbers and Their Operations PPT Teaching Courseware Part One Content: Basic Knowledge Points 1 Mixed Operations of Rational Numbers 1. The correct calculation of the following formulas is (D) A.-7-25=-45 B. 35/44/5=3 C.-22-( -3 )3=31 D.2..

"Mixed Operations of Rational Numbers" Rational numbers and their operations PPT:

"Mixed Operations of Rational Numbers" Rational Numbers and Their Operations PPT Part One: Introduction to Review Compare to see who can calculate more accurately and faster. (1) -10＋(-2)4+3(-4) (2) 18-6 (-2)-2 (-3) Through recall, we know addition and subtraction..

"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..

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Update Time: 2024-11-01

This template belongs to Mathematics courseware Beijing Normal University Edition Seventh Grade Mathematics Volume 1 industry PPT template

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