Math 7 · Unit 2: Expressions, formulae and equations · Cambridge Lower Secondary Maths Stage 7

Questions

1. 1. How many counters does this box have? If you do not know the number, choose your own letter to represent it.

   • 2
   • n
   • 1
   • 0
   Check

2. 2. How many counters does this box have? If you do not know the number, choose your own letter to represent it.

   • 3
   • 4
   • 2
   • n
   Check

3. 3. How many counters does this box have? If you do not know the number, choose your own letter to represent it.

   • n (a letter: you cannot see inside)
   • 3
   • 0
   • 1
   Check

4. 4. How many apples does this bag have? If you do not know the number, choose your own letter to represent it.

   • 4
   • 5
   • 6
   • 7
   Check

5. 5. How many apples does this bag have? If you do not know the number, choose your own letter to represent it.

   • m (a letter: you cannot see inside)
   • 6
   • 1
   • 0
   Check

6. 6. There is one ball in the bag. Add two balls. How many balls are in the bag now?

   • 1 + 2 = 3
   • 2 + 2 = 4
   • 1 + 2 = 2
   • 1 × 2 = 2
   Check

7. 7. Count the balls in the bag. Add two balls. How many balls are in the bag now?

   • 3 × 2 = 6
   • 3 + 2 = 6
   • 3 + 2 = 5
   • 2 + 2 = 4
   Check

8. 8. You cannot see how many balls are in the bag, so you call the number b. Add two balls. How many balls are in the bag now?

   • b2
   • 2b
   • b + 2
   • b
   Check

9. 9. A bag has n counters in it. Match each statement to its expression. The first one has been done for you: "I add three counters to the bag" goes with n + 3.

   • I add three counters to the bag.
   • I add one counter to the bag.
   • I add six counters to the bag.
   • I add nine counters to the bag.
   • I add seven counters to the bag.

   • n + 7
   • n + 9
   • n + 1
   • n + 3
   • n + 6
   Check

10. 10. Sofia has a box that contains t toys. Write an expression for the total number of toys in the box when she puts in four more toys.

    • t + 4
    • 4t
    • t − 4
    • 4 − t
    Check

11. 11. Sofia has a box that contains t toys. Write an expression for the number of toys in the box when she takes out two toys.

    • t − 2
    • 2t
    • t + 2
    • 2 − t
    Check

12. 12. Sofia has a box that contains t toys. Write an expression for the number of toys in the box when she adds five toys.

    • t − 5
    • 5 − t
    • t + 5
    • 5t
    Check

13. 13. Sofia has a box that contains t toys. Write an expression for the number of toys in the box when she takes out half of the toys.

    • t − ½
    • t ÷ 2
    • t − 2
    • 2t
    Check

14. 14. Cheng has s strawberries. Write an expression for someone who has two more strawberries than Cheng.

    • s − 2
    • s + 2
    • 2s
    • 2 − s
    Check

15. 15. Cheng has s strawberries. Write an expression for someone who has three times as many strawberries as Cheng.

    • s + 3
    • s3
    • 3s
    • s ÷ 3
    Check

16. 16. Cheng has s strawberries. Write an expression for someone who has six fewer strawberries than Cheng.

    • 6 − s
    • 6s
    • s + 6
    • s − 6
    Check

17. 17. Cheng has s strawberries. Write an expression for someone who has half as many strawberries as Cheng.

    • s − 2
    • 2s
    • s ÷ 2
    • s + ½
    Check

18. 18. Ali has x paintings. He buys two more paintings. How many paintings does he now have?

    • 2x
    • x − 2
    • x2
    • x + 2
    Check

19. 19. Hamza has t free text messages on his phone each month. So far this month he has used 15 text messages. How many free text messages does he have left?

    • 15 − t
    • t + 15
    • 15t
    • t − 15
    Check

20. 20. Ibrahim is i years old and Tareq is t years old. What is the total of their ages?

    • 2t
    • it
    • t − i
    • i + t
    Check