Worksheet

Matrices: size, entries, add, subtract and scalar multiples

Grade 11 Math Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

  1. 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

  2. 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?

    • 6
    • 2 × 3
    • 3 × 3
    • 3 × 2

  3. 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?

    • 2 × 4
    • 8
    • 4 × 2
    • 2 × 5

  4. Row 1: 6, 4, -4; row 2: 1, 14, -2; row 3: 10, -3, 16. Milo reads matrix A, the school store's stock table. What number is in row 2, column 3 of A?

  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?

  6. 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?

  7. 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 (6, 0), (22, 20) and (18, 10)
    • rows (6, 22, 18) and (0, 20, 10)
    • rows (0, 20, 10) and (6, 22, 18)

  8. Friday: 1 cookie, 18 muffins, 24 apples; Saturday: 17 cookies, 19 muffins, 5 apples. Zee turns the table of the school fair snack sales into a matrix with one row for each day. Which matrix matches the table?

    • rows (1, 17), (18, 19) and (24, 5)
    • rows (1, 18, 24) and (17, 19, 5)
    • rows (17, 19, 5) and (1, 18, 24)

  9. 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?

  10. 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.

  11. Kira only needs one cell of A + B. What is the entry in row 1, column 3?

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Matrices: size, entries, add, subtract and scalar multiples

Answer Key - Grade 11 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

  1. 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

  2. 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?

    • 6
    • 2 × 3
    • 3 × 3
    • 3 × 2

  3. 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?

    • 2 × 4
    • 8
    • 4 × 2
    • 2 × 5

  4. Row 1: 6, 4, -4; row 2: 1, 14, -2; row 3: 10, -3, 16. Milo reads matrix A, the school store's stock table. What number is in row 2, column 3 of A?

    -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?

    9

  6. 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?

    7

  7. 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 (6, 0), (22, 20) and (18, 10)
    • rows (6, 22, 18) and (0, 20, 10)
    • rows (0, 20, 10) and (6, 22, 18)

  8. Friday: 1 cookie, 18 muffins, 24 apples; Saturday: 17 cookies, 19 muffins, 5 apples. Zee turns the table of the school fair snack sales into a matrix with one row for each day. Which matrix matches the table?

    • rows (1, 17), (18, 19) and (24, 5)
    • rows (1, 18, 24) and (17, 19, 5)
    • rows (17, 19, 5) and (1, 18, 24)

  9. 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?

    0

  10. 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.

  11. Kira only needs one cell of A + B. What is the entry in row 1, column 3?

    0