Answer:
The original number is 4 1 5 3 OR 4 5 8 3
Step-by-step explanation:
* Lets find a way to solve this problem
- The end of the 4-digit number is 3
∴ The number is # # # 3
- The number decrease by 738 if the 3 becomes the first number
∴ The new number is 3 # # #
- Make it as a subtraction problem
∵ # # # 3 - 3 # # # = 0 7 3 8
- Lets subtract
∵ 3 - # = 8
∵ 8 > 3 we must borrow 1 from the number before 3
∴ 13 - 8 = 5
∴ # # # 3 - 3 # # 5 = 0 7 3 8
- Put the 5 in the first number, we can not pot it as a first number
bwcause when we subtract it from 3 the answer will be 2 but we
need answer zero
∴ Lets put it before the 3
∴ # # 5 3 - 3 # # 5 = 0 7 3 8
∵ we borrowed 1 from the 5 before
∴ 4 - # = 3
∴ # = 4 - 3 = 1
∴ # # 5 3 - 3 # 1 5 = 0 7 3 8
- Now we must use the 1 in the first number we can not put it as a
number because it is smaller than 3, we must put it in the 2nd
missing place
∴ # 1 5 3 - 3 # 1 5 = 0 7 3 8
∵ 1 - # = 7
∵ 1 < 7 so we must borrow 1 from the number before it
∴ 11 - # = 7
∴ # = 11 - 7 = 4
∴ # 1 5 3 - 3 4 1 5 = 0 7 3 8
- We must use the 4 in the first number and we have only one
missing place (the first place)
∴ 4 1 5 3 - 3 4 1 5 = 0 7 3 8
∴ The original number is 4 1 5 3
* You can find another answer if you put the 5 in the 2nd place in the
first number the answer will be 4 5 8 3 try to do it
