# Only a Genius Can Solve These Simple Math Problems in Less Than Eight Minutes. Can You?

By: Stella Alexander Image: shutterstock

TICK TOCK, TICK TOCK. Add the three, carry the two. TICK TOCK, TICK TOCK. Time's running out! When you think about math, are you jumping for joy or running for cover? While you won't have to worry about any calculus questions, only a genius could solve all these problems in eight minutes. Can you?

When you think about mathematics, there are a lot of basics to remember! There's the order of operations PEMDAS (parenthesis, exponents, multiplication, division, addition, subtraction). Even with this acronym, people are still forgetting to multiply before they add!

Moving past PEMDAS, you might be thinking of the properties of addition and multiplication. Can you remember that a negative plus a negative is always negative? What about when you multiply them?

Your math journey probably took you into Pythagoras and his triangles. A (squared) plus B (squared) equals C (squared) is a sentence that will always be ingrained in your mind. You might have gone through the process of turning mixed fractions into improper fractions all the time. And don't even get us started on those word problems!

While looking at one problem might seem simple, we're putting your math skills to the test. Only a genius could make it through all these questions in eight minutes - and get them right!

Pencils out! The clock is ticking!

123 + 789 =
916
912
Must we explain addition? Just add the numbers and remember to carry!
1002
1158

12 x 12 =
132
144
This is one you should know, right alongside 10 x 10 and 11 x 11. If you don't know it off the top of your head, all you need to do is multiply and remember to bring that zero down to your second line.
156
168

Simplify: 7(7x - (2 - 6y + 4x) + 5y)
76x + 16y - 18
21x + 77y - 14
Simplifying this problem would require you to use the order of operations, PEMDAS. You'd first need to distribute the negative sign across the middle parentheses and then multiply the 7 across each factor.
49x + 16y + 24
56x + 82y - 18

Solve for y: 5y - 35 = 0
y = 7
When solving for variables, you'd first have to add the 35 to both sides of the equation. You'd then solve for y by dividing.
y = -7
y = 11
y = 5

847 - 781 =
52
91
66
This is a simple subtraction problem. If you remember to borrow from the 8, you'll get the proper answer of 66!
71

In the equation: y = -3x + 5, what is the slope?
5
-3
In the equation, y=mx+b, m is the variable used for slope. When replaced with this equation, it would make the slope, -3.
3
15

64 / 8 =
12
4
8
64 is a perfect square meaning that there is a number, when multiplied by itself, gives you 64. This is the case for the number 8, so when 64 is divided by 8, the answer is 8.
6

What is (x^2) x (x^2)?
x^2
x^6
x^4
When dealing with exponents and multiplication, all you have to do is keep the base and add the exponents. This would make the x stay the same, and the exponent would become 4.
x^3

Solve: (7x + 5)(2x - 3)
14x + 9x + 15
14x^2 -11x - 15
When multiplying polynomials, oftentimes you only have to look at the first and last variables in the problem. 7x multiplied by 2x would give you 14x^2. 5x multipled by negative 3 would give you NEGATIVE 15. There is only one answer with these variables.
12x^2 + 16x - 15
None of the above

1.125 + 1.009 =
2.134
This is just another simple addition problem! Just remember to add and carry the numbers over!
2.431
2.341
2.221

Which number falls between the square root of 24 and 26?
4
5
The number 5 falls between the square roots of 24 and 26. Since 25 is a perfect square and would give you 5 if you were to take the square root, you can be sure that 5 falls within these surrounding numbers.
6
7

2.2 x 2.2 =
6.72
5.84
3.96
4.84
When solving a problem like this, you can first pretend that the decimals aren't even there! Once you solve it, remember to go back in and place them. Since both numbers have one digit after the decimal, your answer should have TWO digits after the decimal.

Which of these fraction is larger: 1/2 or 2/3
1/2
2/3
When dealing with fraction, you'd have to set them with the same denominator to find out which is bigger. Since 6 is the LCM, you would multiply 1/2 by 3/3 and 2/3 by 2/2 to compare them and figure out that 2/3 is bigger.

35716 - 20357
19853
16879
17564
15359
Don't let the five digits confuse you! This is a simple subtraction problem! Just subtract and remember to borrow if necessary.

What is the square root of 49?
6
7
Perfect squares are something that should be ingrained in any math geniuses head. Since 49 is a perfect square, this means that there is a number that when multiplied by itself, will give you 49. That number is 7.
8
9

236 / 4 =
61
42
38
59
This is just a simple long division problem! Four goes into 23 five times, and you're left with 3 and you bring down the 6. Four goes into 36 nine times, and this gives you your answer of 59.

Evaluate: [3 - (5 - 4(2 - 5) + 7] +2
-19
For this equation, you first have to remember PEMDAS. First, handle the numbers within the parentheses before multiplying, subtracting, and adding.
-25
18
3

In a deck of cards, what's the probability that the first card you'll draw is red?
1/2
In a deck of cards, you'd first half to remember that there are 52 cards in the deck and that half of them are red. That means, you have a 26/52 chance that the first card you draw will be red. This simplifies down to 1/2.
2/3
1/52
1/16

What is the following number in standard form: 4.67 x 10^3
467
4670
When changing an equation into standard form, the exponent tells you how many places to move the decimal. Since this problem has 3 as the exponent, there should be be 3 numbers following the 4.
46700
46.7

1001 + 5692 =
6215
5429
6693
We can't help you with this one! All you have to do is add. You don't even have to carry any of the numbers.
7862

Evaluate: 4^3 / 2^2
20
12
8
16
4 (cubed) is equal to 64. 2 (squared) is equal to 4. This would give you 64/4 which is 16.

What is the absolute value of |-7|?
0
-7
7
When solving for absolute value, you must first remember that the number CAN'T be negative. Absolute value is the numerical VALUE of the number regardless of its sign.
1

1120 x 10 =
1120
11200
When multiplying numbers by 10, all you have to do is add a zero at the end!
112000
112020

What is 15(squared)?
625
125
225
If you're a math genius, perfect squares should be ingrained in your brain. In order to find the square of a number, you just simply multiply it by itself. 15x15 = 225.
145

7.061 - 2.952 =
4.109
This is just another simple subtraction problem! Don't get confused. Just remember to borrow when necessary!
5.293
4.906
5.628

2.75 / 1.1
3
2.5
When it comes to dividing decimals, all you need to do is divide regularly, but remembering to place the decimal moves straight up from the dividend.
1.75
.75

Change the following number into scientific notation: 70100
7.01 x 10^4
When dealing with scientific notation, the exponent tells you how many places there are before or after the decimal. Since there are four spaces after the 7, this means that the proper scientific notation would have to have the decimal placed after the 7 and a 4 as the exponent.
7.01 x 10^3
7.01 x 10^2
7.01 x 10^5

Which of these numbers is not a perfect square:
36
139
One hundred thirty nine is not a perfect square. The other answers are! Thirty-six is the perfect square of 6, One hundred sixty nine is the perfect square of 13, and 256 is the perfect square of 16.
169
256

11.095 + 11.095
21.105
22.19
For this, all you have to do is ADD! The two .095s will leave you with an insignificant zero at the end of the number.
23.621
23.92

Which of the following numbers has a higher absolute value: |5|, |-8|, |-12|, |4|
-8
-12
When dealing with absolute value, we are talking about the numerical VALUE regardless of the sign, therefore, -12 has the highest absolute value of 12.
4
5

Evaluate: (3^-2) / (2^-3)
8/9
When dealing with negative exponents, you can move the number to the numerator or denominator to make it positive or negative. In this problem, you can move the (3^-2) to the denominator to make it become (3^2). The same could be said for (2^-3). This would make the answer 8/9.
12
6
24

1/2 x 1/2
1/2
1/4
When it comes to multiplying fractions, all you have to do is multiply the numerators and the denominators. 1x1 =1. 2 x 2 = 4. This would give you 1/4.
1
2/3

1100 / 100 =
110
11
When it comes to dividing this problem, since you have 1100 and you're dividing it by 100, the zeroes in the divisor and dividend cancel out.
1
1100

In a deck of cards, what's the probability of the first card being an Ace?
1/52
1/26
1/13
When finding the probability in a deck of cards, you'd first remember that there are 52 cards in a deck and then remember that there are 4 aces. This means the probability of drawing an ace on the first try is 4/52 which simplifies to 1/13.
1/4

216 - 309 =
78
-93
When solving a problem like this, it's easier to just subtract the smaller number from the larger number and remember to make the answer negative!
93
59 