1. Simplifies the decimal point from 30.090 to 30.09.

2.4.03 The expansion to the original 100 times is 403.

3.0.73 is equal to 73 0.0 1.

4.80.6 14 is read as 80.6 14.

5. The left' 4' in' 43.04' is 1000 times of the right' 4'.

6. Countless people are more than 0. 1 less than 0.5.

7. Move the decimal point of a decimal number two places to the left and one place to the right, and the result will be reduced to 10 times of the original number.

270 out of 8 have 0.0438+0. 2.7.

9. The highest digit of the decimal part is ten digits.

10. Replace 300m 100 decimeter with 300m = 0.3km, 100 decimeter =0.0 1 km.

300m 100 decimeter = 0.3 1 km.

1 1.0.2 rewritten as 0.200 after three decimal places; 2.6 Expanding to 10 is 26.

12.3.98 accurate to one tenth of about 4.0; The mantissa after omitting 1 100 million tons is about 40.8 billion tons.

13.0.38 yuan = 3.8.

7.2 square meters = 7 square meters and 20 square decimeters.

14. The following figures shall be kept in one decimal place and approximated.

3.877= 3.877 ≈ 3.9 10.349= 10.349 ≈ 10.3 0.98=0.98 ≈ 1.0

15. A number is 4 in the hundredth, 1 in the tenth, 6 in the hundredth, 8 in the thousandth and 0 in other digits. This number is written as 4 10.068 and pronounced as 4 10.068.

Second, I can calculate.

1. How to calculate it simply?

3000- 178-322 38x 19+38 256 x28÷256 x28 84x 1 1-78

= 3000-( 178+322)= 38x( 19+ 1)= 256÷256 x28 x28 = 84x 10+(84-78)

= 3000-500 = 38x 20 = 1x28x 28 = 840+6

=2500 =760 =784 =846

2。 I will understand.

One meal of waste paper can produce 700 kilograms of paper. If one kilogram of paper can make 25 exercise books, how many exercise books can be made from 14 tons of waste paper?

700x 14x25=245000 (Ben)

A bulldozer can lay 600 meters in three hours. If it paves 10 meter per hour, how many meters can it pave 12 hour?

(600 ÷ 3+10) x12 = 2520 (m)

The original area of a square is 0.067 hectares, but now the area has been expanded to 100 times. How many hectares and square meters are there now?

0.067× 100=6.7 (hectare) = 67000m2.

Every 100 kg of brine contains 4.5 kg. How many kg does 1 kg of brine contain? 1 ton?

4.5 ÷100×1= 0.045kg.

1 ton = 1000 kg, 0.045× 1000=45 kg.

Divide a wire with a length of 17m into 100 segments. How long is each paragraph? How many centimeters?

17 ÷100 = 0.17 (m) =17cm

Uncle Li runs a deli. He went to the market yesterday morning and bought 10 chickens and 10 geese. Chicken average 16.7 yuan, goose average 34.6 yuan. How much did Uncle Li spend?

(16.7+34.6) ×10 = 513 (yuan)