"Rational Numbers" Rational numbers and their operations PPT courseware

Description

"Rational Numbers" Rational numbers and their operations PPT courseware

Here there is a score lower than 0 points. We can use a number with a "-" sign to represent it. For example, -10 (read: minus 10) means a number that is 10 points lower than 0 points;

For a score higher than 0 points, you can add a "+" sign in front, for example, +10 (pronounced: positive 10) means a number that is 10 points higher than 0 points.

Numbers like 10, 1.2, 17... are called positive numbers, they are all greater than 0

Numbers with a "-" sign in front of a positive number are called negative numbers, such as -10, -3...

0 is neither a positive number nor a negative number

Practice in class

Fill in the blanks

(1) If 5°C above zero is recorded as +5°C, then 3°C below zero is recorded as ______________.

(2) East and west are two opposite directions. If -4 meters means an object moves 4 meters westward, then +2 meters means ___________, and the object standing still is recorded as _________.

(3) A certain warehouse transported 7.5 tons of flour, so the shipment of 3.8 tons should be recorded as _______________.

Must do questions

1. In -2; +1/2; -3.5; 11, the positive number is ______________; the negative number is ______________.

2. +1350 meters means 1350 meters above sea level and 200 meters below sea level, recorded as __________.

3. If a rise of 10 meters is recorded as +10 meters, then a drop of 12 meters is recorded as ______________.

4. If it is stipulated that walking 30 meters westward is recorded as +30 meters, then -40 meters means ______________.

5. If 5 above zero is recorded as +5, then 3 below zero is recorded as ______________.

6. A certain warehouse shipped 7.5 tons of flour and recorded it as +7.5. Then it shipped 3.8 tons and recorded it as ______________.

7. Fill in the following numbers in the corresponding brackets:

13, -0.5, 2.7, 123, 0, 2/5, -4, 7/4.

(1) Fraction ( ); (2) Negative integer ( );

(3) Positive fraction ( ); (4) Rational number ( ).

Class summary

1. Both positive and negative numbers come from real life; positive and negative numbers can be used to represent quantities with opposite meanings in practical problems, such as...

2. The numbers learned in primary school are all positive numbers except 0; numbers with a "-" sign in front of a positive number are negative numbers; 0 is neither a positive number nor a negative number, it represents the boundary between positive and negative numbers.

3. The classification method of rational numbers is not unique. It can be divided into two categories according to integers and fractions, and it can also be divided into three categories according to positive rational numbers, zero and negative rational numbers.

Keywords: Rational numbers and their operations courseware, rational numbers courseware, Beijing Normal University version seventh grade mathematics volume PPT courseware, seventh grade mathematics slide courseware download, rational numbers and their operations PPT courseware download, rational numbers PPT courseware download, .ppt format

For more information about the "Rational Numbers Rational Numbers and Their Operations" PPT courseware, please click the Rational Numbers ppt Rational Numbers and their Operations ppt tag.

"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..

"Power of Rational Numbers" PPT courseware 4:

"Power of Rational Numbers" PPT Courseware 4 Collaborative Exploration 1: Fold in half twice and you can cut into 4 pieces, that is, 22 pieces; Fold in half three times and you can cut into 8 pieces, that is, 222 pieces; Question: If you fold in half 10 times, how many pieces can you cut into? ? Please use a formula to express it (no need to calculate the result). If you fold it in half 100 times, the formula...

File Info

Update Time: 2024-07-22

This template belongs to Mathematics courseware Beijing Normal University seventh grade first volume mathematics industry PPT template

Preview