Simplifying Numerical Expressions

Justify

Work Time

Justify

The table shows why 10 − (6 + 9) is equal to 10 − 6 − 9.

  • Work on the table and fill in the missing justifications.
  • Show that 5 − (12 − 4) can be rewritten as 5 − 12 + 4.

HANDOUT: Justifying Equations

Hint:

To show that 5 – (12 – 4) can be rewritten as 5 – 12 + 4, remember that subtracting (12 – 4) is the same as adding the opposite of (12 – 4).