PEMDAS
SIMPLIFY
20(11-9) – 2(5)
30
Which two numbers are neither prime nor composite?
0 and 1
14 - 2 x 7
0
A truck delivered 6 loads of bricks to a worksite. Each load was composed of 128 bricks. The bricks were placed in stacks of 16 after they were delivered. Which equation can be used to find s, the number of stacks?
s = (6x18)/16
Why is it important to know PEMDAS as a mathematician?
So everyone can solve every problem the same (correct) way.
Which numbers are composite?
9, 23, 55, 78
55 and 78
49 ÷ (3+4) + 5
12
Three siblings mowed fields last month to earn money.
Ryan mowed 36 acres.
Holly mowed 3 more acres than Ryan.
John mowed twice as many acres as Holly.
Which equation can be used to find j, the number of acres John mowed?
j = (36 + 3) x 2
What is the saying we use to remember the correct Order of Operations?
Please Excuse My Dear Aunt Sally.
PEMDAS
Eric is thinking of a prime odd number between 30 and 40. What could his number be?
31 or 37
89 − [2(3 × 4) + (9 × 2)]
47
Mrs. Chan gave her 3 children a total of $75 to spend at a movie theater. Each child received the same amount of money. Each child spent $12 for a ticket and $9 for popcorn and drinks. Which equation can be used to find m, the amount of money each child had left over?
(75 / 3) - (12 + 9) = m
What 4 ways could you see multiplication represented using m?
3 x m
3 * m
3m
3(m)
4 X 36
20 – (5+3) x 2 + 4
8
2(4-1) + 4(5+ 1)
30
What is a prime number?
A number that has ONLY 2 factors
What 2 things might you see that stand for P
parenthesis ( )
brackets [ ]
Which list of numbers contains 2 prime numbers and 2 composite numbers?
a.17, 23, 29, 31
b.15, 21, 27, 35
c.19, 27, 31, 33
d.23, 29, 31, 39
C
[(5 x 4) – 6 ÷ 2] + 9
26
2 [(4.2 + 6.01) x (16 ÷ 4)] - 8
73.68
What is a composite number?
A number that has MORE THAN 2 FACTORS