1、( 120-80)÷80=0.5=50%
A: ...
2、( 1)(20- 16)÷20=0.2=20%
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(2)(20- 16)÷ 16=0.5=50%
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3、(23+25-42)÷42≈0. 143= 14.3%
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4( 1)、( 160-5)÷ 160≈0.969=96.9%
(200- 15)÷200=0.925=92.5%
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(2) What percentage of outstanding boys are girls?
52÷36≈ 1.444= 144.4%
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Page 4
1、
1 m, 0.96kg, 4.32, 3.8 and 2/5, 0.75.
2.860× 5% = 430,000 yuan
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3.1800× 20% = 3.6 million yuan.
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4.7500× 10%=750 yuan.
750+7500=8250 yuan
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5. (1800-1600) × 5% =10 yuan.
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Page 5
1(1) 6000× 5.4 %× 3 = 972 yuan.
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(2)972-972×5%=923.4 yuan
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2.2000×5.4%×3=324 yuan
324-324×5%=307.8 yuan
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3.4000× (4.68%-3.06% )× 2 =129.6 yuan.
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4.5000×40%=2000 yuan
2000×4. 14%=82.8 yuan.
82.8-82.8×5%=78.66 yuan
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Page 6
1、×、√、√、×
2、70、95、55、65
3,306 ÷ 360 = 0.85 = 15% discount
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4.2800×( 1-85%)=420 yuan.
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5. Suppose an interesting math book is 10 yuan.
10×20=200 yuan
200×70%= 140 yuan
20÷(4+ 1)=4
4×40= 160 yuan
160 is greater than 140.
A: It's cheaper to buy it at the children's bookstore.