"Division with divisors close to integers" PPT courseware for dividing three-digit numbers by two-digit numbers

Description

"Division with divisors close to integers" PPT courseware for dividing three-digit numbers by two-digit numbers

teaching objectives

1. Combined with specific examples, experience the process of learning the written calculation method of dividing three-digit numbers by two-digit numbers (without adjusting the quotient).

2. Master the written calculation method of dividing three-digit numbers by two-digit numbers (two-digit quotient), and be able to perform calculations correctly.

3. Actively participate in mathematics learning activities, use the estimation experience to treat two-digit numbers as whole tens, and enhance the self-confidence in learning mathematics well.

(1) How many pairs of size 1 shoes can I buy with the money I spend to buy one pair of size 2 shoes?

Observe the situation diagram and talk about what mathematical information you discovered and the problems you want to solve?

69÷23＝_____(even)

You can think of 23 as 20, 20×3=60, and you can probably buy 3 pairs for 69 yuan.

The divisor 23 is close to 20, so you can think of it as 20 to test the quotient.

Answer: I can buy 3 pairs of size 1 shoes.

(2) How many pairs of size 2 shoes can be bought with the same money as one pair of size 3 shoes?

150÷69＝____(double)……____(yuan)

The divisor 69 is close to 70. You can think of it as 70 to test the quotient.

Answer: I can buy 3 pairs of size 1 shoes.

practice

1. There is a 350-meter-long wire. It is cut into sections every 78 meters. How many sections can it be cut into? How many meters are left?

350÷78＝4(sections)……38(meters)

Answer: It can be cut into 4 sections, leaving 38 meters left.

2. How many days will it take for railway workers to repair the 644-meter-long track?

644÷92＝7 (days)

Answer: It takes 7 days.

3. How many wagons are needed to transport 434 tons of goods?

434÷62＝7(sections)

Answer: It takes 7 sessions of wrangling.

4. How many times the life span of a turtle is approximately that of a giraffe?

121÷19＝

Think of 19 as 20, 20×6=120, 121 is about 6 times of 19.

Answer: The life span of a turtle is about 6 times that of a giraffe.

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For more information about the PPT courseware "Dividing three-digit numbers by two-digit numbers with divisors that are close to integers", please click the "Division with three-digit numbers by two-digit numbers with divisors that are close to integers" ppt tag.

File Info

Update Time: 2024-11-25

This template belongs to Mathematics courseware Hebei Education Edition Fourth Grade Mathematics Volume 1 industry PPT template

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