Mental Math
What is the perimeter of a square with an area of twenty-five square centimeters?
20
Evaluate: 324-169
155
How many positive factors does two thousand twenty have?
12
How many ways are there to choose three students from a group of seven students?
35
If you flip a coin three times, what is the probability of having at least one tail?
7/8
What is the slope of the line connecting the point three comma five and the point one comma negative one?
3
The sum of three consecutive integers is 2019. What is the smallest of the three integers?
672
To the nearest thousandth, what is twenty-four divided by twenty-one?
1143
What is one squared, plus two cubed, plus three to the fourth power?
90
What is the sum of all integers from forty-one to one hundred forty, inclusive?
9050
What is the square of fifty-five minus the square of forty-five?
1000
Let 7=3x−y, and 5x=2y+8. What is x+y?
17
A book costs twenty dollars. Its price is reduced by ten percent, and then increased by ten percent for sales tax. What is the final price?
$19.80
What is one hundred mod twenty-five
0
What is the sum of all integers from forty-one to one hundred forty, inclusive?
162
In how many ways could you rearrange the letters in the word D-I-V-I-D-E?
180
Evaluate: 432.
1849
Not counting zero, what is the sum of the first four even numbers in the Fibonacci sequence?
188
If the day before yesterday was Saturday, what day is fifty-three days from the day after tomorrow?
Sunday
Round the square root of two thousand nineteen to the nearest whole number.
45
What is the minimum of the parabola y = x2 - 8x - 2 as a coordinate point?
(4,-18)
A bag of marbles contains 4 red, 6 white and 8 blue marbles. If two marbles are drawn without replacement, what is the probability that both are red?
2/51
In a room of forty people, how many distinct handshakes can be made?
780
What is the positive difference between the degree measure of interior angles of a regular pentagon and a regular dodecagon?
42
Round the square root of two thousand nineteen to the nearest whole number.
9 zeros