Matrices: size, entries, add, subtract and scalar multiples
Grade 11 Math Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
Top line 2, 11, 0; bottom line -4, -6, 2. Jun copies matrix A, a table of numbers, from the board. What size is matrix A?
- 2 × 3
- 6
- 3 × 2
- 2 × 4
Top line 8, -4; middle line -5, 2; bottom line 2, -6. Kira's worksheet shows matrix A as a grid. What size is matrix A, rows by columns?
- 3 × 2
- 2 × 3
- 3 × 3
- 6
Top line -5, 12, -5, -6; bottom line 3, 7, -3, 0. Luz writes a store's inventory counts as matrix A. What size is matrix A?
- 4 × 2
- 8
- 2 × 4
- 2 × 5
Row 1: 0, 9, -3; row 2: 14, 10, -5. Matrix A shows Noah's class library counts. What is the entry in row 1, column 2 of A?
Row 1: -5, 14, 2; row 2: 13, 0, -2; row 3: 7, -1, 9. Pia looks up one entry of matrix A. What is the entry in row 3, column 1?
Monday: 6 pencils, 22 erasers, 18 glue sticks; Tuesday: 0 pencils, 20 erasers, 10 glue sticks. Ren turns the table of the school store's sales into a matrix with one row for each day. Which matrix matches the table?
- rows (0, 20, 10) and (6, 22, 18)
- rows (6, 0), (22, 20) and (18, 10)
- rows (6, 22, 18) and (0, 20, 10)
Row 1: -6, 8; row 2: -2, -7. Matrix B: row 1: 8, -8; row 2: -3, 7. Esme adds matrices A and B. What is the entry in row 1, column 2 of A + B?
Row 1: -8, -8; row 2: 3, -6. Matrix B: row 1: -1, -8; row 2: -7, -7. Jun finds A + B by adding matching cells. What is the entry in row 2, column 1 of A + B?
Read this first
Matrix A
Row 1: -2, -3, -7; row 2: 4, -1, 3; row 3: 4, -2, -8. Matrix B: row 1: 1, 8, 7; row 2: -9, 1, -8; row 3: -9, -2, 6.
Kira only needs one cell of A + B. What is the entry in row 1, column 3?
Matrix A
Row 1: -1, 1, 8; row 2: -1, -3, 2; row 3: -7, -6, 4. Matrix B: row 1: -1, -3, -8; row 2: -1, 5, 4; row 3: -7, 4, -4.
To check one cell of A + B, Luz looks at row 3, column 2. What is that entry?