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SAT II Math I : Number Theory

Study concepts, example questions & explanations for SAT II Math I

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Example Questions

Example Question #1 : Number Theory

Express 374 in base six.

Possible Answers:

$1402_{\textrm{six}}$

$1502_{\textrm{six}}$

$1522_{\textrm{six}}$

$1422_{\textrm{six}}$

Correct answer:

$1422_{\textrm{six}}$

Explanation:

To convert a base ten number to base six, divide the number by six, with the remainder being the digit in the units place; continue, dividing each successive quotient by 6 and putting the remainder in the next position to the left until the final quotient is less than 6.

$374 \div 6 = 62\textrm{ R }\underline{2}$ - the rightmost digit is 2

$62 \div 6 = 10 \textrm{ R }\underline{2}$ - the next digit to the left is 2

$10 \div 6 = \underline{1} \textrm{ R }\underline{4}$ - the next digit to the left is 4, and the digit to the left of that is 1.

$374 = 1422_{\textrm{six}}$

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Example Question #2 : Number Theory

Express $13241 _{\textrm{five}}$ in base ten.

Possible Answers:

971

1,021

921

1,071

1,121

Correct answer:

1,071

Explanation:

Place values in the base five system are powers of five rather than powers of ten. $13241 _{\textrm{five}}$ is equal to

$1 \times 5^{4} + 3 \times 5 ^{3} + 2 \times 5^{2} + 4 \times 5 + 1$

$= 1 \times 625 + 3 \times 125 + 2 \times 25 + 4 \times 5 + 1$

= 625 +375 + 50 + 20 + 1 = 1,071

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Example Question #1 : Number Theory

Which of the following is the smallest prime number: 8,9,11,13,17 ?

Possible Answers:

Correct answer:

Explanation:

A prime number has only two factor, and itself.

This is not true for 8 (2*4=8) or 9 (3*3*=9) so they are not the answer.

11, 13, 17 are all prime numbers and is the smallest so it is your answer.

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Example Question #3 : Number Theory

Which of the following is a rational number?

$\frac{1}{2},\sqrt{5},2i,3.658$

Possible Answers:

$\sqrt{5}$

None

$\frac{1}{2}$

3.658

Correct answer:

$\frac{1}{2}$

Explanation:

A rational number is any number that can be expressed as an integer p or a fraction p/q. In the set of number given only $\tiny \frac{1}{2}$ fits into that category.

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Example Question #1 : Sat Subject Test In Math I

Which of the following is not an irrational number?

Possible Answers:

$\sqrt[6]{125}$

$\sqrt[5]{125}$

$\sqrt[2]{125}$

$\sqrt[4]{125}$

$\sqrt[3]{125}$

Correct answer:

$\sqrt[3]{125}$

Explanation:

A root of an integer is one of two things, an integer or an irrational number. By testing all five on a calculator, only $\sqrt[3]{125}$ comes up an exact integer - 5. This is the correct choice.

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Example Question #2 : Sat Subject Test In Math I

Simplify by rationalizing the denominator:

$\frac{45}{5 + \sqrt{7}}$

Possible Answers:

$\frac{ 25 - \sqrt{7} }{ 2}$

$\frac{ 25 + \sqrt{7} }{ 2}$

$\frac{15 \sqrt{7}}{4}$

$\frac{ 25 - 5 \sqrt{7} }{ 2}$

$\frac{ 25 + 5 \sqrt{7} }{ 2}$

Correct answer:

$\frac{ 25 - 5 \sqrt{7} }{ 2}$

Explanation:

Multiply the numerator and the denominator by the conjugate of the denominator, which is $5 - \sqrt{7}$ . Then take advantage of the distributive properties and the difference of squares pattern:

$\frac{45}{5 + \sqrt{7}}$

$= \frac{45\left (5 - \sqrt{7} \right )}{\left (5 + \sqrt{7} \right )\left (5 - \sqrt{7} \right )}$

$= \frac{45\left (5 - \sqrt{7} \right )}{ 5 ^{2}- \left ( \sqrt{7} \right ) ^{2} }$

$= \frac{45\left (5 - \sqrt{7} \right )}{ 25 -7}$

$= \frac{45\left (5 - \sqrt{7} \right )}{ 18}$

$= \frac{5\left (5 - \sqrt{7} \right )}{ 2}$

$= \frac{ 25 - 5 \sqrt{7} }{ 2}$

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Example Question #1 : Irrational Numbers

$\frac{-5+10i}{3+4i}=?$

Possible Answers:

-1+2i

$-\frac{5}{3}-\frac{5}{2}i$

1+2i

$-\frac{5}{3}+\frac{5}{2}i$

1-2i

Correct answer:

1+2i

Explanation:

$\frac{-5+10i}{3+4i}$

$=\frac{(-5+10i)(3-4i)}{(3+4i)(3-4i)}$

$=\frac{-15+20i+30i-40i^{2}}{9-16i^{2}}$

$=\frac{-15+50i+40}{9+16}$

$=\frac{25+50i}{25}$

=1+2i

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Example Question #1 : Imaginary Numbers

Multiply:

(7 + 3i) (1 - 2i)

Possible Answers:

13 - 17i

7 - 17i

1 - 11i

7 - 5i

13 - 11i

Correct answer:

13 - 11i

Explanation:

Use the FOIL technique:

(7 + 3i) (1 - 2i)

$= 7 \cdot 1 - 7 \cdot 2i + 3i \cdot 1 - 3i \cdot 2i$

$= 7 - 14i + 3i - 6i ^{2}$

= 7 - 14i + 3i - 6(-1)

= 7 - 14i + 3i +6

= 13 - 11i

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Example Question #1 : Number Theory

Evaluate:

$\left (2 + 3i \right )^{3}$

Possible Answers:

8 + 9i

8 - 27i

-62 + 63 i

-4 6+ 9i

-46 + 63 i

Correct answer:

-4 6+ 9i

Explanation:

We can set A = 2, B = 3i in the cube of a binomial pattern:

$\left ( A + B\right ) ^{3} = A ^{3} + 3 A^{2 }B + 3AB^{2} + B^{3}$

$= 2 ^{3} + 3 \cdot 2 ^{2 } \cdot 3i + 3 \cdot 2 \cdot (3i)^{2} + (3i)^{3}$

$= 2^{3} + 3 \cdot 2^{2} \cdot 3i + 3 \cdot 2 \cdot 3 ^{2}\cdot i^{2} + 3^{3} \cdot i^{3}$

$= 8 + 36i + 54 i^{2} + 27 i^{3}$

= 8 + 36i + 54 (-1) + 27 (-i)

= 8 + 36i - 54 - 27 i

= -46 + 9i

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Example Question #101 : Classifying Algebraic Functions

Evaluate $\small \frac{-6+2i}{10-3i}$

Possible Answers:

$\small \small \frac{-54+38i}{91-60i}$

$\small \small \frac{-66+2i}{91-60i}$

$\small \frac{-66+2i}{109}$

You cannot divide by complex numbers

$\small \frac{-54+38i}{109}$

Correct answer:

$\small \frac{-66+2i}{109}$

Explanation:

To divide by a complex number, we must transform the expression by multiplying it by the complex conjugate of the denominator over itself. In the problem, $\small 10-3i$ is our denominator, so we will multiply the expression by $\small \frac{10+3i}{10+3i}$ to obtain:

$\small \frac{-6+2i}{10-3i}\frac{10+3i}{10+3i}=\frac{-60+20i-18i+6i^2}{100-30i+30i-9i^2}$ .

We can then combine like terms and rewrite all $\small i^2$ terms as $\small -1$ . Therefore, the expression becomes:

$\small \frac{-60+2i+6i^2}{100-9i^2}=\frac{-66+2i}{109}$

Our final answer is therefore $\small \frac{-66+2i}{109}$

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SAT II Math I : Number Theory

Study concepts, example questions & explanations for SAT II Math I

All SAT II Math I Resources

Example Questions

Example Question #1 : Number Theory

Example Question #2 : Number Theory

Example Question #1 : Number Theory

Example Question #3 : Number Theory

Example Question #1 : Sat Subject Test In Math I

Example Question #2 : Sat Subject Test In Math I

Example Question #1 : Irrational Numbers

Example Question #1 : Imaginary Numbers

Example Question #1 : Number Theory

Example Question #101 : Classifying Algebraic Functions

All SAT II Math I Resources

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