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A whole number is multiplied by 0, and then 1 is added to the product. If the number was 5,472, what is the final result?

Class 6Whole NumbersWhole Numbers
  • A0
  • B1
  • C5,472
  • D5,473

Step-by-Step Solution

Multiplying by 0 always gives 0, no matter how large the number: . Adding 1 gives 0 + 1 = 1. Answering 5,473 treats the multiplication by 0 as if it left 5,472 unchanged, which is what multiplying by 1 would do.
Answer: B) 1

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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