Q41. What is the next multiple of 7 after 21?
Correct: 28
Next multiple is 28.
Q42. What is 18 + 22?
Correct: 40
18 + 22 = 40.
Q43. What is the value of tan 45°?
Correct: 1
tan 45° = 1.
Q44. What is the value of 1000 ÷ 10?
Correct: 100
1000 ÷ 10 = 100.
Q45. What is the value of 4³?
Correct: 64
4 × 4 × 4 = 64.
Q46. What is the sum of first 10 natural numbers?
Correct: 55
Sum = n(n+1)/2 = 55.
Q47. What is the value of 81 ÷ 9?
Correct: 9
81 ÷ 9 = 9.
Q48. What is the square of 20?
Correct: 400
20 × 20 = 400.
Q49. What is the value of 3 × (4 + 5)?
Correct: 27
4+5=9, 3×9=27.
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