50 kg× 5-50 kg× 0.5 kg =(50 kg -0.5 kg )× 5.
The final result is equal to 247.5 kg. On the question of eggs, when students fill in the unit, they are sometimes not sure whether they should fill in grams or kilograms, which shows that the quality concepts of 1 gram and 1 kilogram have not yet been established. You can practice more in your life and have standards when judging, so remember the weight of common items in your life.
Skills of kilogram problem in primary school mathematics
In grams: a 2-cent coin weighs about 1 gram; A pencil weighs about 6 grams; A math book weighs about 18 grams; A math book weighs about 180 grams; An egg weighs about 50 grams; An apple weighs about 250 grams.
In kilograms: four apples weigh about 1 kg; A stool weighs about 3 kilograms; A pig weighs more than 100 kg. Remember your own weight. When solving problems, we should pay attention to whether the unit is unified and whether it needs to be transformed.
Example: 203 cases of eggs and duck eggs, including eggs 156 cases. How many boxes of duck eggs are there?
Answer: 203- 156≈40 (box).