"Rational Numbers" PPT Courseware 3

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"Rational Numbers" PPT Courseware 3

The temperature on the moon's surface can be as high as 1230C during the day and as low as -2330C at night.

The world's highest peak, Mount Everest, is 8,848 meters above sea level, and the Turpan Basin is -155 meters above sea level.

"Scores higher than 0 and scores lower than 0" "Temperatures above zero and temperatures below zero"

"Profit amount and loss amount" are quantities with opposite meanings.

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.

A section of embankment at the seaside is 20 meters above sea level, a nearby building is 50 meters above sea level, and a submarine is 30 meters below sea level. Now, based on the height of the embankment at the seaside, record it as 0 meters. Then the nearby How should the heights of buildings and submarines be expressed?

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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..

"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...

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Update Time: 2024-09-09

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

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