True or False
T or F: Multiplication always comes before division
False! You multiply and divide in order from L to R.
9 - 3 x 2=12
Wrong order! Multiply, then add. 3 x 2 = 6, and 9 - 6 = 3
How many students are in the full Logic & Rhetoric School?
32
T or F: The first step in the order of operations is multiplication
False! It's parentheses.
5 x 5 + 1 = 30
Wrong order! Multiply, then add.
5 x 5 = 25 + 1 = 26
49 ÷ (3+4) - 5
2
How many teachers are there at our school?
27
T or F: 15-12+3=0
False! It equals 6.
18 - 5 x 2 = 26
Wrong order! Multiply, then subtract.
5 x 2 = 10, and 18 - 10 = 8
56 ÷ (4+4) + 3
10
What is your teacher's dog's FULL name? (Astrid is not allowed to help!)
Atari Biscuit
T or F: 3+4+5 has the same answer as 3+(4+5)
True! Addition is associative.
4 + 5 + 7 - 3 x 2 = 26
Wrong order! Multiply, then add and subtract L to R.
3 x 2 = 6, then 4 + 5 + 7 = 16, and 16 - 6 = 10
20 – (5+3) x 2 + 4
8
(4-1) + 5 x 13
68
What is 19 x 18?
342
T or F: 30 - 6 x 5 = 24 x 5 = 120
False! You have to multiply 6 x 5 first to get 30, so the answer is actually 0!
5 x (10 - (3 + 2)) = 45
Work the parentheses from the inside out.
3 + 2 = 5, 10 - 5 = 5, and 5 x 5 = 25
((1 + 2) x 3 - 4) x 12 - 10
50