QUANT - Arithmetic 1

Question 1

what are counting numbers?

Answer 1

all pos. integers excluding 0

Question 2

what are whole numbers?

Answer 2

all pos. integers including 0

Question 3

what are integers?

Answer 3

all whole numbers (0 inclusive) and their negative counterparts from negative infinity to positive infinity

Question 4

how do you calculate the # of ints in an interval? (inclusive) (i.e. the num of pairs)

Answer 4

( last - first + 1 ) / 2

Question 5

how do you calculate sum of ints in an interval (last num is odd)?

Answer 5

num of pairs x sum + median

Question 6

how to find median

Answer 6

1st # + last # / 2

Question 7

how do you calculate sum of ints in an interval (last num is even)?

Answer 7

num of pairs x sum

Question 8

what rule should you use to determine if 2 is a factor?

Answer 8

if the number is even / if the number ends in 0,2,4,6,8

Question 9

what rule should you use to determine if 3 is a factor?

Answer 9

add all the integers in the number together and see if it’s divisible by 3

Question 10

what rule should you use to determine if 4 is a factor?

Answer 10

if the last 2 digits of the number are divisible by 4, then 4 is a factor

Question 11

how to find # of multiples in an interval?

Answer 11

((last multiple - first multiple) / multiple you’re finding for ) + 1