To make a cream cake, you need 7.5 grams of cream each. How many cakes can 50 grams of cream make?

50 ÷ 0.75 = 66.666 ...≈ 67 (pieces)

2. Error cause analysis:

When finding the approximate number of cakes in this question, many students often get 67 cakes by rounding, regardless of the actual life situation. In real life, after eating 66 whole cakes, the remaining 50 grams of cream is not enough to make a complete cake.

3. Ideas for solving problems:

To solve this problem, we should consider the real life situation. Each cake needs 7.5 grams of cream, 50 grams of cream can make 50÷0.75=66 (blocks) ... 50 grams, and the remaining 50 grams of cream is not enough to make a complete cake, so it should be discarded and the tail removed to solve the problem.

4. Problem solving process:

50÷0.75≈66 (piece)

A: 50 grams of cream can make up to 66 such cakes.

5. Variant correction:

(1) Each suit is made of 2.2m cloth. How many sets of such clothes can 50m cloth make at most?

(2) How many footballs can Uncle Wang buy per 45 yuan with 300 yuan?

(3) Each oil pot can hold 3 kilograms of oil. How many of these oil pots should be prepared to hold 40 kilograms of oil?

(4) If a pile of goods is 13.6 tons, how many times will it be transported by a truck with a load of 4 tons?

(5) The kindergarten bought 50 cakes, every 8 cakes were packed in a box. How many boxes do you need at least?