1. Adjusting Addition / Subtracion By Rebeca Muñoz San Millan

2. How can you do this addition? 571 35 Using a number line…

3. +5 Counting and adjusting… 601 57135 571 Which number do we use first? Why? What is the nearest ten that can help me? 606 +30 What number do we end on?

4. Try this: 800 + 87 = (800 + 90) - 3 = 890 - 3 = 607 We need a volunteer to draw the number line!

5. -30 subtraction… 576 60635 Which number do we use first? Why? What is the nearest ten that can help me? 571 -5 What number do we end on? 606

6. Now solve these : a) 583 – 71 756 – 11234 – 199 b) 645 + 63 572 + 195932 + 299 c) 584 – 97 600 - 401 368 - 199 d) 126 + 88 154 + 99500 - 200