Take the fifth-grade mathematics textbook published by People's Education Publishing House as an example. The third question in Exercise 2 should be as follows:

The third question * * *, there are six small questions to judge whether there is an error in the decimal places of each product.

The first question of 6 questions is 56.7x38 = 2 154.6, and the answer is correct.

1.23x29.2 = 359. 16 (wrong, the correct answer is 35.916); 2.8X5.6 = 1.568 (wrong, the correct answer is15.68); 0.37x0.94=3.478 (wrong, the correct answer is 0.3478); 0.78 x 6. 1 = 47.58 (wrong, the correct answer is 4.758). All four terms are decimals multiplied by decimals. The reason for the error is that one of the two factors has several decimals, that is, the product has several decimals, and the products in these four items are either one decimal more or one decimal less. 1.56x0.9 = 1.404 (correct)