Binary multiplication

Decimals in the first category are multiplied by integers.

1. Omit 2. leave out

3.32.4 72 16.68 155.2

4. (1) 7.9× 60 = 474km

(2) 474× 90 = 4266 km

5. (1)180× 0.20+12 = 48 (yuan)

180× 0.25 = 45 (yuan)

The second one is cost-effective.

(2) The call time is longer than 240 minutes.

The second kind of decimal multiplied by decimal

1.

2.( 1)× (2)× (3)√ (4)√

3.> < = > > =

4.7.68 0.256 6.75 35.7

5.5.28×2.4= 12.672 dm2

4.52=20.25 dm2

6. (1) 3.5 ×1.5 = 5.25 (km) < 6 km, not arrived. (2) Omission

7.17.60×1.2 = 21.12 (yuan) > 20 (yuan), which is not enough.

Approximate quantity of the third category of products

1.

2.( 1)√ (2)× (3)√ (4)√

leave out

4.0.6 12 5.376 39.648 0.0864

5. (1) 6.25× 3.5 ≈ 21.88 (yuan)

(2)9.6×2.42≈23.23 (yuan)

leave out

The fourth lesson is multiplication, multiplication, addition and subtraction.

1.( 1)0.006 (2)3.4 (3)90 (4)3

2.20. 1×0.3×3. 1= 18.693 10.2+3.2×0.25= 1 1

7.06×2.4-5.7= 1 1.244 9.3×4.2-30=9.06

3. 10.08 6.3 4.86

4.45× 1. 1+3.5 = 53 (yuan)

5.1.2× 9.5+3.1=14.5 (kg)

6.24.5+(54-4) × 2.5 = 149.5 (yuan)

Lesson 5 Law of Integer Multiplication

Expand to decimal

1. Omit 2. leave out

3.494.9 1 000 26.73 320

leave out

5.550

6.27.9 tons

7.0.36× (9- 1) = 2.88 (minutes)

Finish and review Lesson 6.

1.(1) ~ (5) omitted.

(6)> < < > < 4.6 yuan

7. 10

Divide a number by the decimal in the third category (1)

1. Omit 2. leave out

3. 17 0.33 707 160

4. 1 1. 16÷(6.5-5.6)×5.6=69.44

In the fourth category, a number is divided by a decimal (2)

1.( 1)A (2)B (3)A (4)A

2.④③①⑥②⑤

3.25 9 870 1.03

4.459 ÷ (337.5 ÷ 4.5) = 6. 12 (hours)

5.0.9 tons 3 tons

6. 14. 1 1÷ 1.7=8.3

Approximate number of the fifth kind of quotient

1.

2.25.0 2.5

3.86 1.72 1.03

4.6.8 0.9 ≈ 7 0.5 meters

5. 150 ÷ 2.6 ≈ 57 (pieces)

6. 1.7

Sixth grade cyclic decimal

1.

2.( 1)× (2)√ (3)× (4)√

3. 1.889 0.35 1 3. 100 20.364 12.6 1 1 0.477

4.( 1)3. 1>3.>3. 14 14>3.4>3. 14

(2) 1.> 1.5> 1.8> 1.854

(3)7.4>7.>7.45>7.0

leave out

6. Yes, 2

Lesson 7 Exploring Laws with Calculator (omitted)

Lesson 8 Solving Problems (1)

1. Omit 2. leave out

3.( 1)+ × ÷ + × ×

(2)+ - ÷ + ÷ ÷

4.3 times

5.585.60 ÷ 48 = 12.20 (yuan)

6. 1.85 times

7. 100 (days)

8. 1.28 yuan

9.=6.2 △=59.55

Lesson 9 Solving Problems (2)

I.1451461.482 49.5

Two. 1. Omit 2.8.5.

3. (145.2-88.7) ÷ 5 ≈12 (vehicle)

4.7 Bundle 5.20kg1.2kg..

6.34 (unit)

7.20 cases

Completion and review of the tenth class

1.( 1) 8.40 3.879 (2) Period 6.36

(3)54.6 1.47 (4)3.5

(5) 17.36 (6) omitted

(7)> = <