- A55
- B50
- C100
- D45
Step-by-Step Solution
The midpoint of 40 and 60 is (40 + 60) ÷ 2 = 100 ÷ 2 = 50. So 50 lies halfway between them.
Answer: B) 50
On the number line, which whole number lies exactly halfway between 40 and 60?
Class 6Whole NumbersWhole Numbers
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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