"Show it, think about it" PPT on understanding numbers within 100

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"Show it, think about it" PPT on understanding numbers within 100

Part One: Learning Objectives

1. By exploring the relationship between the number of discs and the number of placed numbers, students can discover patterns and use patterns to solve some simple problems.

2. Enable students to realize the importance of orderly thinking in independent exploration.

3. Feel the close connection between mathematics and daily life, and feel the charm of mathematics in the learning process.

[Key Points] Consolidate the ideas of numbers and place value during the activities, and deepen the understanding of numbers within 100.

[Difficulty] Cultivate students' ability to summarize during activities.

Put it aside and think about the PPT, part two: analysis of new knowledge

Do the children know what the two people in the picture are doing?

Watch them perform magic. Do you want to try it?

Let’s prepare the tools together first.

Let's do magic together with small discs.

How to arrange the 2 small discs?

How to arrange the 3 small circles?

Let's observe the rules of numbers composed of 5 small discs.

The sum of the ones digits and tens digits is 5.

Can children discover any patterns?

The number of composed numbers is always 1 more than the number of small discs.

So we can judge the number of composed numbers based on the number of discs.

think about it

Can 11 numbers be formed from 10 small discs?

The numbers composed of 10 small discs are 19, 28, 37, 46, 55, 64, 73, 82, 91. There are 9 numbers in total. Why not 11?

There are 9 numbers made up of 10 small discs. Is there any secret to this? What about the 11, 12... small discs?

10 ones are 1 tens, and a small disc placed on the tens place is 1 tens. 10 small discs cannot be used to represent 10, so the two-digit number formed is less.

Put it aside and think about the PPT, part three: classroom exercises

How many small discs are the numbers below made of?

3 12 21 30

Oral answer: These numbers are arranged from 3 small discs.

How many small discs are 81 and 63 made of?

Oral answer: 81, 63 is composed of 9 small discs.

Xiao Ming’s grandma’s age this year is made up of 7 small discs. Can you guess how old Xiao Ming’s grandma might be this year?

The numbers composed of 7 small discs are: 7, 16, 25, 34, 43, 52, 61, 70

Oral answer: Xiao Ming’s grandma may be 52, 61 or 70 years old this year.

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"Put it up and think about it" PPT download on the understanding of numbers within 100 Part One: Brain Teasers Under what circumstances can a small circle represent 10? Under what circumstances does 1+1=3? 3 oranges are divided among 5 children. How to divide them fairly? Under what circumstances is 0 greater than 2?

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"Put it On and Think About it" Flash Animation Courseware This courseware helps students learn the knowledge points of "Put it on and Think About It" in the form of exercises and improves students' interest in learning. It is a great way to consolidate knowledge points and review the course. Good courseware. Keywords: "Show it,..."

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Update Time: 2024-10-03

This template belongs to Mathematics courseware People's Education Press First Grade Mathematics Volume 2 industry PPT template

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