Identification Numbers
A digit used to detect errors in an identification number.
What is a check digit?
A cipher where every letter is shifted by the same amount.
What is a Caesar cipher?
Money originally saved or borrowed.
What is principal?
In compound interest formulas, the variable r represents this.
What is the interest rate?
The first two numbers in the Fibonacci sequence.
What are 1 and 1?
True or False: Social Security numbers are completely random.
What is False?
For a traveler’s check to be valid, the sum of all digits must be divisible by this number.
What is 9?
In a Caesar cipher, shifting letters 3 spaces to the right encrypts A as this letter.
What is D?
Interest that applies only to the original principal.
What is simple interest?
In compound interest formulas, the variable t represents this.
What is time in years?
Find the next Fibonacci number: 3, 5, 8, 13, ___
What is 21?
In a Vigenère cipher, the keyword repeats in this way.
What is over and over throughout the message?
UPC codes use these two weights repeatedly.
What are 3 and 1?
A cipher that repeatedly uses a keyword to determine shifts.
What is a Vigenère cipher?
Find the simple interest earned on $500 at 4% for 3 years.
What is $60?
True or False: Compound interest grows faster than simple interest.
What is True?
As Fibonacci numbers grow larger, ratios of consecutive terms approach this value.
What is the golden ratio?
The next Fibonacci number after 34 and 55.
What is 89?
A bank routing number beginning with 15 is automatically this.
What is invalid?
In a Caesar cipher, common repeating letters can help determine this.
What is the shift?
Interest that applies to both the principal and previously earned interest.
What is compound interest?
The value of n that should be used if a bank account compounds quarterly.
What is 4?
The approximate value of the golden ratio.
What is 1.618?
A golden spiral is built using these shapes.
What are golden rectangles?
A 10-digit ISBN is valid if its weighted sum is divisible by this number.
What is 11?
True or False: A Vigenère cipher uses the same shift for every letter in a message.
What is False?
A savings account compounds interest monthly. How many compounding periods occur each year?
What is 12?
The mistake made if a student forgets to convert 5% into decimal form before using a finance formula.
What is failing to rewrite the percent as 0.05?
A rectangle whose side lengths have ratio close to 1.618 is called this.
What is a golden rectangle?
A UPC or EAN code is valid only if the weighted sum is divisible by this number.
What is 10?