Children's homework has always been to make everyone embarrassed, the focus is not to know how to tell the child, how to let the child understand, mainly the child does not like to ask the teacher, can only do their best!
Students in the third grade, for mathematics, the child's solution ideas are not clear, often wrong, and several times have no good effect, let's take a look at this problem!
The above question is relatively better to understand:
According to the problem of inversion, ask how much to actually pay, you need to know the number of purchases and unit price, Meituan unit price 26 already knows, just ask for the purchase quantity.
Because the Meituan purchase is 26, the store purchase is 29, and the Meituan purchase pays 29-26 = 3 (yuan) less per share.
The question said that she paid 96 yuan less for buying several copies, so it can be known that she bought 96 ÷ 3 = 32 (copies), which is the number she bought in the METUAN.
So she actually paid: 26x32 = 832 yuan.
Some of the following questions children do not understand, involving the age problem, the age difference is constant, this needs children to remember.
So this year the age difference between Dad and Mingming is:
40-12=28 (years)
The difference between Dad's age and Ming's age is still 28 years old, which can be listed on scratch paper like this:
Dad's age = 3 obvious ages
Daddy - Ming = 28,
That is, 3 Mingming - Mingming = 28, 2 Mingming = 28,
So Ming = 14 (years).
Can columnar sub: 28÷ (3-1) = 14 years).
That is to say, when Mingming is 14 years old, his father's age is 3 times that of Mingming.
This question can also be expanded to, how many years later, dad's age is 3 times that of Mingming, when Dad's age is 3 times that of Mingming, how old is Dad?
I don't know what everyone thinks about this line of thinking, whether there is any problem, why is the child still not very clear?