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Math 9 · Unit 2: Expressions and formulae · Cambridge Lower Secondary Maths Stage 9

2.1 Substituting into expressions

53 questions · e.g. Find cd² + ab when a = 2, b = −3, c = 4, d = −5

Practice

Questions

  1. 1. Copy and complete the workings to find the value of each expression when x = 10. 2x + 3

    2 × x + 3 = 2 × 10 + 3=+ 3 =

    Fill the blanks with these.

    Check

  2. 2. Copy and complete the workings to find the value of each expression when x = 10. x/2 − 4

    x ÷ 2 − 4 = 10 ÷ 2 − 4=− 4 =

    Fill the blanks with these.

    Check

  3. 3. Copy and complete the workings to find the value of each expression when x = 10. 4x²

    4 × x² = 4 × 10²= 4 ×=

    Fill the blanks with these.

    Check

  4. 4. Copy and complete the workings to find the value of each expression when x = 10. 3(x + 2)

    3 × (x + 2) = 3 × (10 + 2)= 3 ×=

    Fill the blanks with these.

    Check

  5. 5. When a = 8 and b = 4, match each expression to its value.

    • a + b
    • a − b
    • ab
    • 2a + b
    • 20
    • 12
    • 32
    • 4
    Check

  6. 6. Copy and complete the workings to find the value of each expression when x = 6 and y = −2. x + y

    x + y = 6 + −2=−=

    Fill the blanks with these.

    Check

  7. 7. Copy and complete the workings to find the value of each expression when x = 6 and y = −2. x − y

    x − y = 6 − −2=+=

    Fill the blanks with these.

    Check

  8. 8. Copy and complete the workings to find the value of each expression when x = 6 and y = −2. x² + y²

    x² + y² = 6² + (−2)²=+=

    Fill the blanks with these.

    Check

  9. 9. Copy and complete the workings to find the value of each expression when x = 6 and y = −2. 3x + y

    3x + y = 3 × 6 + −2=−=

    Fill the blanks with these.

    Check

  10. 10. Copy and complete the workings to find the value of each expression when x = 6 and y = −2. x + 4y

    x + 4y = 6 + 4 × −2=−=

    Fill the blanks with these.

    Check

  11. 11. Copy and complete the workings to find the value of each expression when x = 6 and y = −2. 3x + 4y

    3x + 4y = 3 × 6 + 4 × −2=−=

    Fill the blanks with these.

    Check

  12. 12. Find a + b when a = −3 and b = 5.

    Check

  13. 13. Find 3a − b when a = −3 and b = 5.

    Check

  14. 14. Find 20 − ab when a = −3 and b = 5.

    Check

  15. 15. Find a² + 4 when a = −3.

    Check

  16. 16. Find 7b/5 when b = 5.

    Check

  17. 17. Find b³ − 25 when b = 5.

    Check

  18. 18. Find a + 2b when a = 2 and b = −3.

    Check

  19. 19. Find bd − 10 when b = −3 and d = −5.

    Check

  20. 20. Find 4b + 2a when a = 2 and b = −3.

    Check