Please – Excuse – My – Dear – Aunt - Sally
3-10 Parentheses in Number
Sentences
 So – are these number sentences true or false?
 28 – 6 + 9 = 31
 28 – 6 + 9 = 13
3-10 Parentheses in Number
Sentences
 Both can be true – depending on where you add the
parentheses
 Just like Aunt Sally taught us – we need to follow the
directions – we can’t do it in any order we want.
3-10 Parentheses in Number
Sentences
 Just remember
 Please – Excuse – My – Dear – Aunt – Sally
 Parentheses – Exponents – Multiplication – division –
Addition – Subtraction

Ignore exponents – we have not gotten that far yet 
3-10 Parentheses in Number
Sentences
 You must go in that order!
 Parentheses – this shows you which operation to do
first!
 (28 – 6) + 9 = 31
 28 – (6 + 9) = 13
3-10 Parentheses in Number
Sentences
 Let’s try another now that you know!
 Make these number sentences true by adding
parentheses where they are needed.
 10 – 3 * 2 = 14
 10 – 3 * 2 = 4
3-10 Parentheses in Number
Sentences
 Let’s see if you can tell if these number sentences are
true or false even when they have parentheses in them.
 15 + (2 * 5) = 25
 (4 * 8) – 4 = 16
3-10 Parentheses in Number
Sentences
 Let’s try some more!
 12 = (24 / 6) * 3
 (36 / 6) / 2 < 12
 20 < 40 – (9 + 11)
 4 * 9 > (6 * 6) -5
3-10 Parentheses in Number
Sentences
 Here are some example of the individual work you will
be doing:
 Sample 1 :

Which operation do you do first?
 Sample 2:

15 – 7 * 2 = 16
Add parentheses to make the number sentence true.
 Sample 3:

12 + (4 / 4) = _____
5, 5, 20
Target = 3
Using only these three numbers – make a number sentence
that will equal the target number.
3-10 Parentheses in Number
Sentences
 Homework Page 71
3-10 Parentheses in Number
Sentences
 Potentially 3-10 Page 97 From Miss Mendon