3 ×0.3= 5×0.24= 0.38+3.8= 1-0.09=

13.5×0. 1= 0.99+0. 1= 0.99×5=

0.35×4= 0.5×0.3= 0. 125×7×8=

1×2.5- 1×2.5= 0.8+ 1.3-0.8+ 1.3=

Second, fill in the blanks carefully with your head and hands. (Per grid 1 min, *** 14 min)

1.0.6+0.6+0.6+0.6+0.6=( )×( )

2. If 32× 15 = 480,

Then 3.2×15 = ();

32×0. 15=( );

3.2×0. 15=( )

3.a is a number greater than 0.

When a (), 2.5× a > 2.5.

When a (), 2.5× a = 2.5.

When a (), 2.5× a < 2.5.

Xiao Kai did several questions and forgot to count the decimal point. Please help him point out the decimal point.

36×2.4=8 6 4 13×0.25=3 2 5 14.4×3.98=5 7 3 1 2

5. When calculating decimal multiplication, first move the decimal point of a factor to make it an integer, then see how many decimal places a factor has, and then move the decimal point of the product to ().

The clock turned () degrees clockwise from 3 o'clock to 6 o'clock.

Third, I am a little judge, and I will judge right and wrong. (65438+ 0 points for each question, ***5 points)

1, one factor is expanded by 10 times, and the other factor is reduced by 10 times, and the product remains unchanged. ( )

2. Multiply two decimal places, and the product must be less than one of them. ( )

The product of 3.8.2×9.5 must be two decimal places. ( )

4. Parallelogram is an axisymmetric figure. ( )

The product of 5.0.7×0.7 is rounded to one decimal place, which is about 0.5. ( )

Fourth, think carefully and put the correct answer in brackets. (2 points for each question, ***6 points)

1. The figure with only one axis of symmetry in the figure below is ().

A: rectangle b: text shape c: sector d: equilateral triangle

2. Calculate the number of 83.3× 1.2, and keep one decimal place ().

A: 100 b: 100.0 c: 99.9 d: 99.96

3. The graph rotates 90 counterclockwise around point B to get ()

:D:

Be careful, I can calculate. (***26 points)

1. Estimate. (65438+ 0 points for each question, ***8 points)

3.92×5. 1 7.2×0.8 30. 125×2.98 45.02× 19

2.49×0.38 4.9×3.8 0.58×68.75 42×58

2. Use vertical calculation. (2 points for each question, *** 12 points)

0.04×0. 12= 3.84×2.6≈ 5.76×3=

(Keep one decimal place)

0. 125× 1.4≈ 14×0. 16= 4.8×0.25=

(Keep two decimal places)

3. Off-mold calculation. (as simple as possible) (3 points for each question, * * * 9 points)

2.5×7. 1×4 64-2.64×0.5 5.2×0.9+0.9×4.8

6. Turn knowledge into beautiful patterns. (1 item 4 points, 2 items 5 points, *** 12 points)

1. Draw the other half of the axisymmetric figure, then rotate the figure 90 degrees clockwise around the O point three times, and draw the figure after each rotation in turn, so that the four figures are combined into a beautiful pattern.

2. Rotate A in the figure below 90 degrees clockwise around the O point to get B, and then translate B to the right by 5 squares to get C. ..

Seven, use knowledge to solve problems. (5 points for each question, ***25 points)

1. This is the water, electricity and gas bill of Xiaoqing's house. How much do you need to pay?

The last reading and the current reading actually consume the unit price amount.

Water 146 ton 173 ton () is 2.90 yuan ().

Electricity charge 109 kwh 146 kwh () is 0.44 yuan () yuan.

Gas137m3154m3 ()1.90 yuan () yuan.

2. How tall is Dad? (Figures shall be kept to two decimal places)

3. Xiaohua plans to run every morning 1 thousand?

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