Solve the Equation: Finding the Unknown in 12-?=15

Solve the following problem:

12−?=15 12-?=15

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the unknown
00:03 Find point (12) on the axis
00:07 Find the desired result (15) on the axis
00:12 Find the number of jumps between the result and starting point
00:17 We can see that the difference is +3
00:26 Negative times negative always equals positive
00:30 Therefore we subtract by (-3)
00:37 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following problem:

12−?=15 12-?=15

2

Step-by-step solution

We know that the distance between 12 and 15 is three steps.

In other words:

12+3=15 12+3=15

Now let's remember the rule:

−(−x)=+ -(-x)=+

We'll substitute x with the number 3 as follows:

12−(−3)=15 12-(-3)=15

Therefore, the answer is minus 3

3

Final Answer

−3 -3

Practice Quiz

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a is negative number.

b is negative number.

What is the sum of a+b?

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