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Authoritative PPT Summary
"Today I am in charge" PPT courseware 2
1. Situation introduction
Can you calculate these two questions?
0.55×75=
0.55×64=
What mathematical information do you know from the picture?
2. Cooperation and exploration
0.55×75=41.25
0.55×64=35.2
Think about it: How do you multiply a decimal by an integer?
Law song
Multiply decimals, see integers,
Accurate positioning is the most critical.
The trailing zero, don't show up,
There are not enough bits, so use zeros to occupy them.
3. Independent practice
1. Calculate.
3 5 1.0 5
×0.2 7 × 3 2
2 4 5 2 1 0
7 0 3 1 5
9 4 5 3 3 6 0
2. Oral calculation.
0.37×10＝ 25×4＝ 5×12＝ 13×30＝
0.37×100＝ 2.5×4＝ 5×1.2＝ 1.3×30＝
0.37×1000＝ 0.25×4＝ 5×0.12＝ 0.13×30＝
One factor remains unchanged, the other factor is expanded to 10 times, 100 times, 1000 times..., and the product is also expanded to 10 times, 100 times, 1000 times...
One factor remains unchanged, and the other factor is reduced to the original 1/10, 1/100, 1/1000... The product is also reduced to the original 1/10, 1/100, 1/1000...
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"Today I am in charge" PPT courseware 5:
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"Today I am in charge" PPT courseware 4:
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"Today I'm in charge" PPT courseware 3:
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