The statement below is followed by four options. Each option is related to the item in the statement, but only one is always true. Select the option that always holds and makes the statement true.
"A multiple of 10 always has ______."
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 0 in its units place
The answer must hold for every multiple of 10, without exception. An option that is present in most cases but can be missing in even one case is not always true.
Option (1) Exactly two digits — 100 and 250 are multiples of 10 with three digits.
Option (2) 0 in its units place — 10 × any whole number ends in 0 (10, 20, 30, ... 250, ...), since a number is divisible by 10 only when its units digit is 0, so this is always true.
Option (3) An odd tens digit — 20 has the tens digit 2, which is even.
Option (4) 3 as a factor — 10 itself is not divisible by 3.