# Worksheet on Addition of Matrices

Practice the problems given in the worksheet on addition of matrices.

If M and N are the two matrices of the same order, then the matrices are said conformable for addition, and their sum is obtained by adding the corresponding elements of M and N.

1. Find the sum of A and B where A = $$\begin{bmatrix} 2 & 3\\ -5 & 7 \end{bmatrix}$$ and B =  $$\begin{bmatrix} 4 & 6\\ 2 & -11 \end{bmatrix}$$

2. Find A + B when A = $$\begin{bmatrix} 2 & 3 & 4\\ 5 & 6 & 7\\ 8 & 5 & 11 \end{bmatrix}$$ and B = $$\begin{bmatrix} 3 & -2 & -3\\ 5 & 4 & 3\\ 1 & 3 & 2 \end{bmatrix}$$

3. If A = $$\begin{bmatrix} -1 & 2 & -3\\ -2 & 1 & 4 \end{bmatrix}$$ and B = $$\begin{bmatrix} 0 & -1 & 2\\ 3 & 0 & 1 \end{bmatrix}$$, then find the sum of A and B.

4. If $$\begin{bmatrix} 2 & 3\\ -5 & 4 \end{bmatrix}$$ + $$\begin{bmatrix} -2 & 1\\ x & 3\end{bmatrix}$$ = $$\begin{bmatrix} 0 & 4\\ -3 & 9 \end{bmatrix}$$, find the value of x.

5. Given A = $$\begin{bmatrix} 1 & 4\\ 2 & 3 \end{bmatrix}$$ and B = $$\begin{bmatrix} -4 & -1\\ -3 & -2 \end{bmatrix}$$, compute A + B.

6. If $$\begin{bmatrix} 5 & -3\\ 2 & 4 \end{bmatrix}$$ + A = $$\begin{bmatrix} 1 & 0\\ 0 & 1 \end{bmatrix}$$, find the matrix A.

7. Given M = $$\begin{bmatrix} 1 & 3\\ 2 & 4 \end{bmatrix}$$, find a matrix N such that M + N = $$\begin{bmatrix} 0 & 0\\ 0 & 0 \end{bmatrix}$$.

8. If A = $$\begin{bmatrix} 1 & 0 & 2\\ 0 & 2 & 3\\ 1 & 0 & 0 \end{bmatrix}$$, B = $$\begin{bmatrix} 0 & -1 & 0\\ -2 & 0 & 3\\ 0 & 1 & 2 \end{bmatrix}$$ and C = $$\begin{bmatrix} 2 & 3 & 1\\ 0 & 0 & -3\\ 1 & 1 & -1 \end{bmatrix}$$, find A + B + C.

1. $$\begin{bmatrix} 6 & 9\\ -3 & -4 \end{bmatrix}$$

2. $$\begin{bmatrix} 5 & 1 & 1\\ 10 & 10 & 10\\ 9 & 8 & 13 \end{bmatrix}$$

3. $$\begin{bmatrix} -1 & 1 & -1\\ 1 & 1 & 5 \end{bmatrix}$$

4. x = 2

5. $$\begin{bmatrix} -3 & 3\\ -1 & 1 \end{bmatrix}$$

6. $$\begin{bmatrix} -4 & 3\\ -2 & -3 \end{bmatrix}$$

7. $$\begin{bmatrix} -1 & -3\\ -2 & -4 \end{bmatrix}$$

8. $$\begin{bmatrix} 3 & 2 & 3\\ -2 & 2 & 3\\ 2 & 2 & 1 \end{bmatrix}$$