256 times 9 minus 46 times 9 simple calculation

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1. I want to ask 56.25 inches is equal to how many centimeters? Is it 143? When I work, I always have the conversion between inch and centimeter. The integer is 0.50.75, so I don't know how to calculate it. By the way, how many inches is 143 cm I'm very dissatisfied with your answer. I hope experts can guide me!
2. How many hectares is 0.6 square kilometers?
3. How many hectares is 5 / 8 square meter?
4. How many hectares is 8.07 square kilometers equal to
5. Three eighths of a hectare equals () square meters
6. 167000 square kilometers equals several square meters. 16807.8 square kilometers equals several square meters
7. 0.5 km2 = () ha
8. 56.87 km2 = () ha
9. 1.56 square kilometers =? Hectares =? Square meters?
10. 56 sq m = () ha Why?
11. What is the greatest common factor of 28 and 42______ ．
12. English translation Text translation of Unit1 in module3!
13. How many meters is 1000 mm
14. 88…… 8×99…… 9 clever calculation 88…… 8×99…… nine 2001 82001 9 Please calculate as follows:= = =
15. What is the information retrieval language, what kinds of retrieval languages are there, and points out the five major categories of CLC
16. A rectangular piece of land, the ratio of length and width is 8:5, length is 24 meters more than width. How many square meters is the area of this land?
17. Decompose 20.75.111.123 into prime factors,
18. A cuboid container, 30 cm in length, 15 cm in width and 8 cm in height. Pour the water into a cuboid container with 20 cm in edge length, What's the depth of the water? There is 4cm deep water in the cuboid container
19. A = 2 × 2 × 3 × 7, B = 2 × 2 × 2 × 7, the greatest common divisor of a and B is______ The least common multiple is______ ．
20. The king is always lucky