Solve the Addition Equation: Finding the Missing Number in -3 + ? = 5

Question

3+(?)=5 -3+(?)=5 -5-5-5-4-4-4-3-3-3-2-2-2-1-1-1000111222333444555

Video Solution

Solution Steps

00:00 Complete the missing part
00:03 The number is directed and negative
00:09 The negative direction on the axis is left, so we'll take 3 to the left
00:15 This is the desired number, let's find it on the axis
00:26 Let's find its distance from point (-3)
00:36 The direction of progress is to the right (positive)
00:45 And this is the solution to the question

Step-by-Step Solution

To find out how much we need to add to the number negative 3 in order to get 5, we will count the number of steps between the two numbers.

Also, we will pay attention to which direction we moved, if we moved to the right then the number is positive, if we moved to the left the number will be negative.

We will start from the number negative 3, and move to the right until we reach the number 5, with each step representing one whole number, as follows:

-5-5-5-4-4-4-3-3-3-2-2-2-1-1-1000111222333444555

We discover that the number of steps is 8. Since we moved to the right, the number is positive

Answer

8 8