Partial reference answer

Unit 1 Fractional Multiplication

Fractional multiplication (1): ⒌ meters. 30 bundles. 24 cases. Page 85.

Fractional multiplication (2):χ( 1)√(2)×(3)×(4)×. 300 kilometers. Once 100 kg. ⒏60.(9) 45.⒑3 years old. 80 bags

Fractional multiplication (3): 13. ( 1) C (2) C (3) D (4) C. ⒋⑴×⑵×⑶×⑷×。 6.kg， 14 kg。 350 math books and 50 English books. ⒏22.

Unit detection: 1) m, 7) m. 168 people, 56 people. ⒊⑴√⑵×⑶×⑷×⑸√。 ⒋⑴B⑵B⑶A⑷C⑸D。 120 yuan, 40 yuan, 40 yuan. ⒏m2, m2. Mom is 39 years old and Lele is 6 years old. (5) Xiaohong and Kobanawa Xiaogang (2) Xiaohong is the fastest and Xiaohua is the slowest. 5. Width10km, with an area of 2km. 5] 90, 80, 4 10.⒔

The second unit cuboid (1)

Understanding of cuboids: 1) √ 2 × 3 × 4 ×. ⒋370cm。 ⒌3cm。 ⒍ 144cm2。

Unfolding and folding: 1. ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈ ⒈. 3 sides: 8 pieces; Two sides: 24 pieces.

Surface area of cuboid: 1. ⒈ 448.⑵24。 ⑶ 160。 ⑷ 100。 ⑸3 18。 ⒉⑴×⑵×⑶√⑷×⑸×。 150 decimeter 2. 880 square centimeters. 320㎡。 ⒏504 cm 2. 9184 square meters. ⒑138m2

Exposed surface: 1. 3. (2) 7500 square centimeters. (3) 384 square centimeters. (4) 1 12cm2。 13. 10，640㎡。 4.80 square centimeters, 48 square centimeters. 26 square centimeters. ⒍ 192cm2。

Unit test:1) √ 2× 3× 4× 5 √. ⒊⑴C⑵B⑶B⑷C⑸B。 5 centimeters. 2 100 square centimeter. ⒏ 176dm2, 1056 yuan. ⒐ 160dm2

Unit 3 Fractional Division

Countdown: 13. ( 1) × (2 )× (3) √.⒋⑴D。 (2) C, A, B, (3) B, (4) A, C.5 and 9.

Fractional division (1):13 √ 2× 3× 4× 5 √. 4. Xiao Mingliang, Xiao Hong looks at page 40 and Xiao Ming looks at page 64. 5. Rice. 6. meters, meters two. ⒎ kilometers. ⒏c、b、a。

Fractional division (2): 1. χ χ χ χ χ χ χ χ χ χ. Six tons. ⒏√○√○。 ⒐、>。

Fractional division (3): 13. (1) A (2) B (3) C, B (4) C.

2.258 copies. Four trips, God. 30 kilograms of apples and 5 kilograms of baskets. 30 meters. ⒏ at a loss.

Mathematics and life

Paint the wall: 13. 4168cm2. Floor tiles are 2000, and tiles 10000. (about 622kg. 5.① 150 liter. ⑵ It is cost-effective to buy VAT, 1275 yuan. 66 square centimeters.

Fold: 1. Cuboid, 64 square centimeters.

Unit test: ⒌ (1) 7. (2) 880 meters. (3) 200 yuan. ④20 kilograms. 5] 15km。 [6] 540 square meters.

Temporary detection

⒈⑻297。 ⑼。 ⑽3。 ⑾64、384。 ⑿ 10。 3. greater than. ⒉⑴×⑵√⑶√⑷√⑸√⑹√⑺×⑻×⑼×。 ⒊⑴a⑵b⑶a⑷c⑸c⑹c。 (1) 600 kg. (2) 40.6 yuan. (3) 312cm2. (4) 35kg. ⒎

The fourth unit cuboid (2)

Volume and volume: ⒌ Not necessarily, because the thickness of the cup wall may be different.

Unit of volume: 1. 1. ⒈4cm3, 9 cubic centimeters, 10 cubic centimeters. ⒋cm3、m3、l、cm3、ml、ml。 5. The second scheme is more cost-effective. ⒎ 14、3

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Cuboid volume: 1. 8cm3， 18cm3， 13cm3。 [6] (1) 160 cubic centimeters (2) 100. ⒏ 144 liters. Pet-name ruby 22.5 liters. ⒑8 decimeters. (5) (1) has been expanded by 2 times. (2) it has been expanded to eight times. (3) The volume remains unchanged.

Volume conversion unit: 13. 3. Economic value of1.25l. It is 25 cm long, 4 cm wide and 5 cm high. The volume is 500cm3. ⒌ 1500m3。 7,200 cubic centimeters. 4,500 yuan. ⒎ 124dm2、 120dm3。 8.

Interesting measurement: 1. Stone. 2 stones. (3) Divided by 100. ⒉ 120cm3。 ⒊ 12.6cm3。 ⒌0.5dm3。

Unit test: 1. (1) × (2 )× (3 )× (4) √ (5) √. ⒊⑴B⑵A⑶A⑷C⑸B。 ⒌⑴8m2、4m3。 ⑵ 2700m3. ⑵64000m3, 64dm3. (4) 240 cubic centimeters.

Unit 5 Fractional Mixing Operation

Fractional mixed operation (1): 1. (3),,,. ⒉⑴√⑵×⑶×⑷×⑸√。 ⒊⑴B⑵B。 5.( 1) Enough. (2).1.3 (3) 25 points. 40 people, 44 people.

Fractional mixed operation (2): 1. C 2。 B 3。 A. ⒋。 . 4 164 yuan. ⒍。 Well depth 12m, rope length 52m.

Fractional mixed operation (3): 1. (1)1(1)1. ⒉⑴√⑵√⑶×⑷√⑸√。 ⒊⑴C⑵C⑶B⑷B。 40 kilograms. ⒍。 ⒎。 22 1 yuan.

Unit test: 1 × 2 √ 3 √ 4 × 5 ×. ⒊⑴B⑵B⑶A⑷C⑸A⑹B⑺C。 (1) 85 vehicles. ⑵70 degrees. (3) 270 square meters. (4) 1200 yuan. Once 18 yuan.

Unit 6 percentage

Recognition rate: 1. 1%, 52.⑵ 14。 ③ July, August and July. ⑷25、 10、50、500。 ⑸3%、97%。 ⒉⑴×⑵×⑶×⑷×⑸√。 ⒊⑴A⑵A⑶D。 ⒍50%。 ⒎ 150%。

Qualified rate: 1. 97%.⑵99%。 ⑶96%。 (4) Electrical Department, 100%, shoes and hats department, 95%. ⒉⑴√⑵×⑶×⑷×⑸×。 ⒊⑴C⑵B⑶B⑷A。 4. Starlight card and Zhongle card. ⒌42%。

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Protein content: 1. 0.3, 65, 13.⑵、35。 ③250, 0.9 liter. ⑷9、 10、300、30。 ⒉⑴×⑵×⑶√⑷×。 6.583 grams. ⒍2 1%。 Protein 200g, fat100g, sugar150g and minerals 50g.

I'm in charge this month: 2.40 kilograms. 500 grams, 340 grams of water and 50 grams of fat. The excellent rate of class one in five years is high, and the unqualified rate of class two in five years is high. 50 people

Unit test:1) √ 2) √ 3× (4 )× (6 )× (7 )× (8 )× (9 )× ⒊ (1) A _ 2 B _ 3 B _ 4 B _ 6 C _ 6 B. ⒎ (1) 270.②770 copies. (3) 1000.⒏30 kg.

Mathematics and shopping

Estimated cost: ⒐ Lost, loss 16 yuan. ⒑ Put the10cm edge of this small box against the10cm edge of the box.

Shopping strategy: 1. 2. Two at most. [13] (1) B (2) C (3) C (4) 3 species, 5 species. 2. store B.5. A shop. [6] into the white brand towel.

Packaging knowledge: 1. 1 176cm2。 ⒉90×39。 3. 5000 cm2. 4. 585 cm2. 2.110.8 cm. 6. ⒍30cm2.

Unit 7 Statistics

Sector map: ⒎ (1) 12. ②92 volumes. ⒏⑴48%。 (2) 5,000. (3) 2,400 chickens. (9) 2400 yuan. ⑵ 1080、504。

Olympic Games: 1) C 2 A 3 B. ⒌ (1) sector. ⑵36%。 (3) 150 people. (4) There are 48 musicians and 33 artists. Wages increase year by year. 100 yuan, 800 yuan. (3) About 2200 yuan. 7. Novels account for about 23.8%, poems for about 9.5%, paintings for about 47.6%, magazines for about 14.3% and reference books for about 4.8%.

Median and mode: 1 × 2 √ 3 × 4 × 5 × 6 √. ⒊⑴C⑵C⑶C。 ⒌⑴ 144cm。 ⑵ 144、 144。 (3) 1 44.2 cm. (1) About 1245.5 yuan. ⑵ The mode is 750, and the median is 750. (3) Unreasonable.

General revision

23.( 1) 6 160 square decimeter. ⑵ 24,000 cubic decimeters. 24.50 cubic centimeters.

final exam

Easy to drill:1) √ 2× 3 √ 4×ψ×Φ×⑽⑾×. ⒊ (1) b, ⑶ d, ⑶B, ⑶ a, ⑸B, ⑹D, ⑺ Ability improvement: 6. Large package 2.4 yuan, small package 0.66 yuan. ⒎ 14.4cm3。 ⒏⑴56m2。 (2)179.2 yuan. 58.3%, 28 kg.