7 + 4 7 (4) 15 (20) 15 + 20 – Look back at the previous exercises. Which is easier to think about, addition or subtraction? What pattern do you notice with the subtraction exercises? Write an equivalent addition expression for each subtraction expression and then simplify the expression. Subtraction Expression Addition Expression Simplified Example: 3 5 3 + (–5) – –2 6 –2 – 9 14 – 7 (–4) – (–7) –10 – 12 8 – 3 –5 – (–15) –1 – 6 (–8) – Write each term as two equivalent expressions both involving subtraction. Example: (–3) or 3 7 –4; –7 − −
7 + 4 7 (4) 15 – (20) 15 + 20 Look back at the previous exercises. Which is easier to think about, addition or subtraction? What pattern do you notice with the subtraction exercises? Write an equivalent addition expression for each subtraction expression and then simplify the expression. Subtraction Expression Addition Expression Simplified Example: 3 – 5 3 + (–5) –2 –2 – 6 9 – 14 7 – (–4) –10 – (–7) 12 – 8 –5 – 3 –1 – (–15) 6 – (–8) Write each term as two equivalent expressions both involving subtraction. Example: –4; –7 − (–3) or 3 − 7