The 1000-grain weight of rice is 18-23 grams, and one kilogram, that is, 1000 grams /20 is equal to 50, that is, about 50,000 grains, including more than 55,600 smaller grains and more than 43,000 larger grains.

Method 1: Choose a small cup as a tool, first fill a cup of rice, count the number of rice grains contained in a cup of rice, then see how many cups 1 kg can fill, and finally calculate the total.

Method 2: Use a small balance to weigh 100g of rice, then count how many grains there are, and finally multiply by10.