1.   Use models to write an expression and a number sentence. Then solve.

There were 8 plates on a table. A waiter took 5 away. How many were left?

    A. 5 + 3; 5 + 3 = 8 B. 5 − 8; 5 − 8 = 3
    C. 3 + 5; 3 + 5 = 8 D. 8 − 5; 8 − 5 = 3
    Hint

  2.   Use models to write an expression and a number sentence. Then solve.

A secretary made 12 photocopies. Then she made 4 more. How many photocopies did she make in all?

    A. 4 + 8; 4 + 8 = 12 B. 12 − 4; 12 − 4 = 8
    C. 12 + 4; 12 + 4 = 16 D. 12 + 4; 12 + 4 = 18
    Hint

  3.   The − symbol makes which statement true?
    A. 45 + 10 = 25 ___ 30 B. 42 − 30 = 5 ___ 7
    C. 50 ___ 2 = 62 − 10 D. 33 ___ 11 = 21 + 1
    Hint

  4.   The − symbol makes which statement true?
    A. 4 ___ 8 = 21 − 9 B. 8 = 14 ___ 6
    C. 12 ___ 5 = 17 D. 3 + 6 = 4 ___ 5
    Hint

  5.   Use counters to show whether + or − makes the number sentence 8 ___ 6 = 2 true. Explain.
    A. −; 8 counters − 6 counters = 2 counters left. B. +; 2 counters + 6 counters = 8 counters altogether.
    C. +; 6 counters + 2 counters = 8 counters altogether. D. −; 6 counters − 8 counters = 2 counters left.
    Hint