The numbers are between -13 and 13, excluding -13 and 13 themselves.
Multiples of 3 in this range:
−12,−9,−6,−3,0,3,6,9,12
Count of multiples of 3 = 9
Multiples of 5 in this range:
−10,−5,0,5,10
Count of multiples of 5 = 5
The number 0 appears in both lists as it is divisible by both 3 and 5.
To avoid double-counting:
Total count =9+5−1
Total count =13
Complete list of numbers that are multiples of 3 or 5:
−12,−10,−9,−6,−5,−3,0,3,5,6,9,10,12
Therefore, there are 13 numbers between -13 and 13 that are multiples of 3 or 5.