1，6cm = () mm 3km = () m () m = 80m。

2, 9 000 kg = 5 kg () tons = 4 kg () grams = 4 kg () tons.

3. 80mm = () cm 1 decimeter-5cm = () cm

4, 49 is 7 times (); Seven times that of () is 63

5. It takes () seconds for the second hand to turn from the number "10" on the clock face to the number "4".

6. When looking up 756-427=329, you can use () plus () to see if it is equal to (); Or subtract () from () to see if it is equal to ().

7. Xinxin is tall 128 () and weighs 28 ().

8. A bottle of water is 500 grams, and four bottles of water weigh () grams or () kilograms.

9. The thickness of the math textbook is about 7 (), and the speed of the car is 80 ().

10, Xiaoming weighs 35 (), a car carries 5 (), and a whale weighs 32 ().

1 1、76( )56+35 8003( )800+3 4×9( )40

The number of 12 and 19 exceeding 335 is ().

Second, judge carefully. 10 (tick "√" for the right and "×" for the wrong. 2 points per question)

1. In addition, the sum must be greater than two addends. ( )

A bag of rice weighs 45 tons. ( )

Wang Xin weighs about 28 grams. ( )

It took five hours from 8: 30 in the morning to 3: 30 in the afternoon. ( )

5, 8 kilograms of wood is lighter than 8000 grams of bricks. ( )

Third, be careful. 24﹪

1, oral calculation (each question 1 point, ***8 points)

50+390= 800+ 120= 720-50= 4 × 8=

400+300= 300+50= 60+ 150= 27÷9=

2. Vertical calculation of column requires checking calculation. (4 points for each inspection, the remaining 2 points, *** 16 points)

259+ 148= 4 10-207= 404- 186=

Check calculation:

857+476= 755+ 165= 304- 195=

Check calculation: