Open Middle®
Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the equality true:
Hint
What does absolute value mean? How does that relate to two numbers? How would that relate to equality?
Answer
There are many possible solutions. One example would be 3 + 4 = | 2 – 9 |
Source: Bryan Anderson
I don’t find this problem SO worth solving, as the absolute value is not needed (the digits of the subtraction can be arranged in any order to create a positive value).
It would be much more interesting if the 7 selected digits were asked to be arranged from least to greatest in a sentence like this: ____ + ____ ____ = | ____ ____ – ____ ____ |
I don’t find this problem SO worth solving, as the absolute value is not needed (the digits of the subtraction can be arranged in any order to create a positive value).
It would be much more interesting if the 7 selected digits were asked to be arranged from least to greatest in a sentence like this: ____ + ____ ____ = | ____ ____ – ____ ____ |
I adjusted the problem by adding a negative sign inside the absolute value sign: ____ + ____ = |-____ + ____|
3+4 = 2-1
I did 7+1= (1-9)
I did 1+7=(1-9)
3+4 = 2-1
7+1-= (1-9)
i did 4+3 = (9-1)