We write simple expressions (number sentences) from the verbal description, using several operations and parenthesis. In other words, we need to take into account the order of operations here! For example, subtract 12 and 6, and multiply the result by 4.... one needs parenthesis to make sure the subtraction happens BEFORE multiplication. If you write 12 - 6 x 4, the multiplication would be done first according to the order of operations. Therefore, the right answer is either 4 x (12 - 6) or (12 - 6) x 4.
Lastly, we get to solve some puzzles where the operation signs are missing. Mathy my mascot mammoth is of course excited about that!
The first part of the lesson explains the order of operations (using the four operations plus parenthesis), and is found here:
Tagged under: 4th grade,math,order operations,number sentences,expression,parenthesis,puzzle,operations
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