intro 370 50 2 Addition and Subtraction Properties with Hank Buckingham reminder 380 40 You may be starting to see a pattern here. attention rectangle 5 380 45 0 Do you get the same result if you write 3+4+2 or 3+2+4? reminder 390 10 500 35 2 It doesn't work with subtraction, just addition! comment 5 200 200 15 Notice how it's all addition? attention rectangle 0 360 50 See how I'm following order of operations when doing the addition? comment 5 I hope this marker doesn't run out of ink! reminder 380 10 50 450 0 There are other ways to group and change the order--the answer will still be 48! comment Do you think subtraction will work? attention rectangle You can change the order and grouping as long as the operation is addition-not subtraction!