Addition
985+542
1527
1010-568
442
758x21
15,918
Caleb bought a bag of 600 marbles. 35% were clear, 20% were white, 15% were green, 15% were blue, and the rest were red. How many of the marbles are red or white?
red marbles 15%
white and red together 35%
So there are 210 marbles that could be white or red
An arrangement of objects in equal rows
Array
19856+25652
45,508
9004-7998
1006
425x17
7,225
Elizabeth tosses two six-sided dice. What is the probability that their sum is a multiple of 5?
4 ways to get 5 and 3 ways to get 10 out of a possibly 36 ways to roll 2 dice, so it is 4+3/36 or 7/36
PEMDAS
Parenthesis, Exponent, Multiply, Divide, Addition and Subtraction
Order of operations
Let n = 2772. Replace each 2 with a 5 and each 7 with a 1. Call the new number m.
What is the value of n + m ?
7887
10502-8779
1723
145x87
12,615
Bob was doing a subtraction problem while eating his lunch and spilled on it, covering some digits. What are the digits he is missing?
1527
- 9??
--------
5?9
38 and 8
Top number of a fraction
Numerator