solve the equation using mental math 7+r=15
Just subtract 7 from both sides of the equation.
r = 8
Or, since you know:.
7 + 8 = 15
r must be 8
thank you
To solve the equation 7 + r = 15 using mental math, you can follow these steps:
Step 1: Start with the equation 7 + r = 15.
Step 2: Simplify the equation by subtracting 7 from both sides to isolate the variable r.
7 + r - 7 = 15 - 7
r = 8
Therefore, the solution to the equation 7 + r = 15 is r = 8.