1, the thickness of a math book is 5 mm, how many centimeters are eight such math books?

Is 2.2-ton truck loaded with three 600-kilogram machines overloaded?

3. Six elephants weigh 24 tons, and how many tons do eight elephants weigh?

4. Mom took Xiaoming to see grandma by coach, and it was 308 kilometers on the way. They set off at 8 am, and the bus travels at an average speed of 80 kilometers per hour. Can you arrive at noon 12?

5. Students in bright primary school are conducting military training. March at night, "Erlian" walked 2200m, and "Erlian" walked less than "Erlian" 150m. So how many meters did "Lian Yi" and "Er Lian" travel?

6. Use a 2-meter-long piece of wood and saw it into four pieces with the same length to make stool legs. How high is this stool?

7. Lan Lan's home is 800 meters away from the library. She went out to borrow books from the library. After walking 100 meters, she found that she forgot to bring her library card. She hurried home to get her library card, and then went to the library. During this time, how far did light light blue go?

* After 8 bowls of water are poured into a bucket, the total weight of bucket and water is 2000g; After pouring 10 bowl of water, the total weight of bucket and water is 2400g. How much does this bucket weigh?

The distance that the little frog jumps each time is 5 cm. Now it is on the lotus leaf 280 cm from the shore. How many steps does the frog have to jump to jump to the shore?