Whole Number Mental Add and Subtract Subtracting (to 10) Slides 2-5 Subtracting (to 20) Slides 6-8 Teachers Use these experiences with whole numbers in any order to suit student needs. The experiences should be repeated many times across the year. Where possible, coordinate your language (and student language) to the actions occurring onscreen. Hints To use the pointer pen option to write numbers as provided by students: Click Slide Show. Right click mouse. Select Pen. To start at a specific slide: Click on Slide Show. Scroll to the Slide you want. Click From Current Slide.

4 - 4 = 7 - 2 = 5 9 - 3 = 6 Say: I am going to put an take-away sum on the screen. The answer to the sum will also show after a few seconds. Ask: Can you answer the sum before the answer appears? Click to show the first sum. The answer will appear after 2 seconds. Repeat for 3 more sums.

8 - 3 = 5 5 - 2 = 3 9 - 4 = 5 As for slide 2.

9 - 7 = 2 9 - 3 = 6 7 - 4 = 3 As for slide 2.

8 - 7 = 1 6 - 4 = 2 7 - 5 = 2 As for slide 2.

13 - 3 = 10 17 - 5 = 12 18 - 3 = 15 As for slide 2.

14 - 4 = 10 15 - 5 = 10 16 - 6 = 10 As for slide 2.

12 - 6 = 6 15 - 6 = 9 11 - 6 = 5 As for slide 2.