Recycling is fine EXCEPT when you 're-use' a number in a math problem -- don't do it!
In the problem you just solved:
5 + 3(10)
You used the digit '4' (inside the parentheses) TWICE -- you added it to the 6 to get 10; then you multiplied that 10 by 3 (outside the parentheses). Next you added the 5, but then you added on that 4 again! Once you write down the answer to '6 + 4', the six and the four are gone.
Please solve this problem carefully -- without re-using any of the quantities:
7 + 3(4 + 2) =
Order of Operations Automatic Flip-Through SLIDE SHOW
Overview of the Order of Operations
© 1992, 1999 Amby Duncan-Carr All rights reserved.