How to complete 1.2.4.8

How to complete 1.2.4.8

16 32 64 128 256

Primary school first grade mathematics problem, more than 7, what is the number of 8?

7+8=15
The number of eight more than seven is 15

Watch him write math problems, 14-8, he is first 8-4 = 4, 10-4 = 6, is this a numerical calculation method? He said he thought it
I know that the teacher taught me ten methods, that is, 14-8 = 10-8 + 4 = 2 + 4 = 6. However, all the problems he is doing now are subtraction within 20. So, the result is right, and I think his calculation is also fast

Your son is still very smart. This method is commonly used in real life. You have 14 apples, and you need to give me 8. There are many clocks to give me. This is a commonly used method. I will give you my odd 4 first, not enough to give you another 4 from the whole 10. But most children can't understand this method, so the teacher won't talk about this method, but we should

10,1,8,2,6,4,4,2,7, find out the rule and add two more numbers? Why?
Sorry! Wrong number. It should be 10,1,8,2,6,4,4,7,2

Add the numbers on odd digits of 11 and 0, i.e. the first, third, fifth and seventh numbers are 10, 8, 6, 4 and 2 respectively, and the latter number is less than the former number by 2, then the number after 2 is 0, while the number on even digits, i.e. the second, fourth, sixth and eighth numbers are 1, 2, 4 and 7 respectively, and the difference between the latter number and the former number is 2-1 = 1, 4-2 = 2, 7-4 = 3 respectively