Question 1: A math book weighs about (). 1? 3 grams of 2? Three kilos. Three? 300g 3kg = 3000g 1k g =1000g because 300 < 1000 < 2000 < 3000, a row of 3kg, 300g, 2000g,1kg is 300g < So the answer is: 300 g < 1 kg < 2000 g < 3 kg.

Question 2: 1. Fifty math books in the class are piled together. How much does it weigh? Think about it: a math book weighs about () grams, so () this math book weighs about 50 math books in the class. How much does it weigh? Think about it: a math book weighs about (100) grams, so (10) this math book weighs about 1 kg.

So: (1)x(5) two (5) (kg)

Fifty math books weigh about 5 kilograms.

Question 3: Weight: How many math textbooks weigh 500 grams? Estimate: How many kilograms do 50 math textbooks weigh? How many math textbooks weigh 500 grams? Estimate: 50 math textbooks weigh about 5 kilograms.

Question 4: Five math books weigh about one kilogram, and several math books weigh about one ton 1000x5=5000.

5000 math books weigh about one ton.

Question 5: How much do 20 math books weigh?

Question 6: How many grams of math books?