issb mathematics MCQ #489

Sum of first 10 natural numbers?

issb mathematics MCQ #489

  1. Question 1

    Q1. Sum of first 10 natural numbers?

    • A) 45
    • B) 50
    • C) 55
    • D) 60

    Answer: 55

    Explanation: Formula n(n+1)/2 gives 10 times 11 divided by 2 equals 55. Work each step carefully; ISSB math rewards accuracy under time pressure.