"Rational Numbers" PPT Courseware 2

Description

"Rational Numbers" PPT Courseware 2

We often hear weather forecasts:

Today's highest temperature

Beijing -10℃, Haikou 20℃,

Hangzhou 10℃, Qingdao 0℃

If a number lower than 0 appears above, we can use a number with a "-" sign (pronounced: negative) to represent it. For example, -10.

For numbers higher than 0, you can use numbers with a "+" sign (pronounced as: positive) to represent them. For example, +10, +20.

Example 1(1) In a knowledge contest, if +10 points means adding 10 points, how do you express deducting 20 points?

(2) Someone rotates the turntable. If +5 is used to represent 5 turns in the counterclockwise direction, how does it mean that it is turned 12 times in the clockwise direction?

(3) In a certain table tennis quality inspection, a table tennis ball exceeding the standard mass by 0.02 grams is recorded as +0.02. So what does -0.03 grams mean?

Solution: (1) 20 points will be deducted and recorded as -20 points;

(2) Turn 12 times in the clockwise direction and record it as -12 times;

(3)-0.03g means that the mass of the table tennis ball is 0.03g lower than the standard mass.

fill in the blank:

1. Profit is stipulated to be positive. A company lost 25,000 yuan last year and recorded it as ________ million yuan. This year it made a profit of 32,000 yuan, which was recorded as ________ million yuan;

2. It is stipulated that the altitude above sea level is positive. Urumqi, Xinjiang is 918 meters above sea level, which is recorded as altitude___________;

3. The lowest point of Urumqi is 155 meters below sea level, which is recorded as altitude __________.

Positive integers, zero, and negative integers are collectively called integers;

Positive fractions and negative fractions are collectively called fractions

Keywords: Rational numbers courseware, New People's Education Edition seventh-grade mathematics PPT courseware, seventh-grade mathematics slide courseware download, rational numbers PPT courseware download, .ppt format

For more information about the "Rational Numbers" PPT courseware, please click the Rational Numbers ppt tab.

"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: 2024-11-22

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 1 industry PPT template

Preview