"Oral Calculation and Estimation" Multiplication of three-digit numbers by two-digit numbers PPT courseware 2

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Western Normal University Edition Fourth Grade Mathematics Volume 1	pptx	6 MB

"Oral Calculation and Estimation" Multiplication of three-digit numbers by two-digit numbers PPT courseware 2

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Upload Time: 2024-09-30

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Description

"Oral Calculation and Estimation" Multiplication of three-digit numbers by two-digit numbers PPT courseware 2

teaching objectives

In this lesson, we mainly learn the oral arithmetic and estimation of multiplication. Students must master the oral arithmetic method, correctly calculate two-digit multiplication orally; master the estimation method, correctly estimate the product of two numbers, and solve practical problems.

A person rides a bicycle approximately 16 kilometers in one hour

(1) How many kilometers can a person ride a bicycle in 3 hours?

16×3=48 (km)

(2) How many kilometers can the express train cover in 3 hours?

160×3=480 (km)

Do it

1. A book has 50 pages, each page has 23 lines, and each line has 26 words. Approximately how many thousand words does this book have?

23≈20

26≈30

50×20×30=30000

50×20×30=30000=30,000

2. Xiaoli walks 52 meters per minute. How many kilometers does she walk in one hour?

53≈50

1 hour = 60 minutes

50×60=3000

50×60=3000 meters=3 kilometers

Summary of this lesson

What did we mainly learn in this lesson? Discuss among classmates.

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For more information about the PPT courseware "Oral Calculation and Estimation of Multiplication of Three-Digit Times by Two-Digit Numbers", please click the Oral Calculation and Estimation of Multiplication of Three-digit Numbers by Two-Digit ppt ppt tag.

"Oral Arithmetic and Estimation" Multiplication of three-digit numbers by two-digit numbers PPT courseware:

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Update Time: 2024-09-30

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"Oral Calculation and Estimation" Multiplication of three-digit numbers by two-digit numbers PPT courseware 2