"Harvest Season" PPT Courseware 5

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"Harvest Season" PPT Courseware 5

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1.2×15= 4×4= 3×80=

30÷2= 16÷4= 240÷3=

2.24÷4 Divide 24 into () and 4,

First ()÷4=(), then ()÷4=(), then ()+()=().

From ancient times to recent times, farmers' farming methods have undergone great changes.

Farming method Cultivated area per hour (square meters)

Manpower 6

Cattle 60

Walk-behind tractor 96

Four wheel tractor 540

question:

How many times the average area cultivated by a walking tractor per hour is that of a human force?

Require:

1. Solve it independently first and list the formulas.

2. Communicate in groups.

(What do you think when doing oral division calculations where the divisor is one digit and the dividend is two digits?)

Oral calculation method: 96÷6=

① Divide 9 tens by 6 to get 1 tens, leaving 3 tens, add 3 tens to 6 to get 36, divide 36 by 6 to get 6, add 10 to 6 to get 16.

② 60÷6=10,36÷6=6,10+6=16

(Do you have any other good methods?)

Oral arithmetic:

64÷4 90÷6 72÷3

640÷4 900÷6 720÷3

98÷7 96÷8

980÷7 960÷8

Question: How many times the average area plowed by a four-wheel tractor per hour is equivalent to that of an ox?

Require:

1. Solve it independently first and list the formulas. (Independent thinking and oral arithmetic)

2. Communicate in groups. (Discuss the method of oral arithmetic in the group)

Oral calculation method: 540÷60

① Multiplication 60×9=540 540÷60=9

② Division 54÷6=9 540÷60=9

(54 tens divided by 6 tens, we get 9)

③ 540÷6=90 90 ÷10=9

(Think of 60 as the product of 6 and 10)

I am the best!

80÷20 50÷10 60÷30

160÷80 120÷30 100÷50

250÷50 360÷60

320÷40 390÷30

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Update Time: 2024-11-22

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

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