Solve the Equation: Finding the Missing Number in 12+?+3-1=29

12+?+3−1=29 12+?+3-1=29

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Identify the missing number
00:04 Given that all operations are addition/subtraction
00:07 We may use the commutative property and solve in a different order
00:18 Arrange the exercise in the simplest way possible
00:27 Continue to solve
00:36 Isolate our unknown
00:49 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

12+?+3−1=29 12+?+3-1=29

2

Step-by-step solution

To find out which number is missing, we solve the entire exercise to know which number we will have to add to obtain a result of 29:

12+3−1= 12+3-1=

15−1=14 15-1=14

To make 14 equal to 29, we will have to add 15.

Let's verify:

29−14=15 29-14=15

3

Final Answer

15 15

Practice Quiz

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\( 8 - 2 + 6 = \)

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