"Ancient Counting" Addition and Subtraction PPT Download

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"Ancient Counting" Addition and Subtraction PPT Download

Part One: Situation Import

In ancient times, in order to record the number of prey, people used stones or knotted ropes to count.

Question import

Knowledge point 1: Understand the numbers and their compositions from 11 to 20

Bundle a bundle and identify it.

10 ones 1 tens

10+1=11

Summary: (1) When counting, count one by one. Ten ones is one tens, and a dozen is composed of one tens and several ones.

(2) The first digit from the right side of the counter is the ones digit, and the second digit is the tens digit.

Knowledge point 2: Calculation method of adding a few to 10

Important tips

Ten plus a few equals ten.

1 ten is 10 ones

There are 6 in total

There are (10+6) ones in total

10+6=16 or 6+10=16

Knowledge point 3: The order of numbers from 10 to 20

Counting from front to back: 10,11,12,13,14,15,16,17,18,19,20.

Counting from back to front: 20,19,18,17,16,15,14,13,12,11,10.

12 is behind 11 and in front of 13

16 is 1 more than 15 and 1 less than 17

19 is between 18 and 20

Knowledge point 4: The size of numbers within 20

Compare, who is bigger? Who is younger?

Knowledge Point 5 Ancient Counting

The ancients expressed 12 this way. Can you express 13 this way?

Ancient Counting PPT, Part 2: Knowledge Summary

1. Starting from the right side of the counter, the first digit is the ones digit. If there are several counters, write them in the ones digits. If there are no counters, write 0. The second digit is the tens digit. If there are several tens, write the number in the tens digit. If there is no tens, write the number in the tens digit. If there is no tens, write the number in the tens digit. Omit the tens digit and do not write it.

2. On the ruler, count the numbers 10 to 20. The number on the right is larger than the number on the left.

Mathematician Hua Luogeng

Hua Luogeng is a world-class mathematician with only a junior high school diploma. After graduating from junior high school, he dropped out of school because he could not afford the tuition. Later, he spent seven years studying all high school and college courses by himself, and successively taught in several universities at home and abroad. At the age of 19, he began to publish professional papers on mathematics, and eventually became a famous mathematician.

Keywords: Beijing Normal University edition first grade mathematics PPT courseware free download, ancient counting PPT download, addition and subtraction PPT download, .PPT format;

For more information about the PPT courseware "Addition and Subtraction Counting the Ancients", please click the Addition and Subtraction PPT Counting the Ancients PPT tab.

"Ancient Counting" Addition and Subtraction PPT (Lesson 2):

"Ancient Counting" Addition and Subtraction PPT (Lesson 2) Part One: Classroom Introduction 1. Master the order and major of each number from 11 to 20..

"Ancient Counting" Addition and Subtraction PPT (Lesson 1):

"Ancient Counting" Addition and Subtraction PPT (Lesson 1) Part One: Classroom Introduction 1. Understand the symbolic representation of each number from 11 to 20. 2. In specific situational activities, master the order of numbers within 20 and initially establish the concept of number. 3. Cultivate the ability to use mathematical language to...

"Ancient Counting" Addition and Subtraction PPT Courseware 3:

"Ancient Counting" Addition and Subtraction PPT Courseware 3 Counter Children: Hello! My name is Counter. Starting from my right: the first digit is the ones digit, and the number of beads on it represents several ones; the second digit is the tens digit, and the number of beads on it represents several tens. 1..

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Update Time: 2024-07-06

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

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