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Arrange these whole numbers from least to greatest: 12,505 ; 12,055 ; 1,205,500 ; 120,505. Which is the SMALLEST?

Class 6Whole NumbersWhole Numbers
  • A12,055
  • B12,505
  • C120,505
  • D1,205,500

Step-by-Step Solution

Compare digit-by-digit. 12,055 (about 12 thousand) is the smallest, then 12,505, then 120,505 (hundred-thousands), then 1,205,500 (over a million). So the smallest is 12,055.
Answer: A) 12,055

Key idea: Closure: when an operation 'stays inside' the whole numbers

Adding two whole numbers always gives a whole number — addition is **closed** on whole numbers. Multiplying two whole numbers always gives a whole number — multiplication is **closed** too. But subtraction is **not** closed: 5 − 7 = −2, which is not a whole number. Division is also not closed: 7 ÷ 2 = 3.5, not a whole number. Closure is the property that lets us trust an operation never to take us 'outside' the world of whole numbers.

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