✅ Answer Key & Solutions
Q1
C
Factors of 24: 1,2,3,4,6,8,12,24. Factors of 36: 1,2,3,4,6,9,12,18,36. HCF = 12
Q2
B
Multiples of 4: 4,8,12... Multiples of 6: 6,12... First common = 12
Q3
C
3.75 + 4.25 = 8.00
Q4
C
15/100 × 200 = 30
Q5
C
0.77 > 0.707 > 0.7 > 0.07
Q6
B
12.5 × 4 = 50 tonnes
Q7
C
HCF(18,24)=6; 18÷6=3, 24÷6=4 → ¾
Q8
C
LCM(3,5) = 15 days
Q9
C
2+1=3; ⅓+⅔=3/3=1; total = 3+1 = 4
Q10
C
HCF(8,12)=4; LCM(8,12)=24; 4×24=96 = 8×12=96 ✓
Q11
B
8×4=32; two decimal places → 0.32
Q12
C
Discount = 20% of 1250 = 250; Sale price = 1250−250 = ₹1,000
Q13
C
45/60 = ¾ (HCF=15)
Q14
C
LCD=24: 3/4=18/24, 5/6=20/24, 7/8=21/24, 11/12=22/24. Smallest=18/24=3/4
Q15
C
12 ÷ 1.5 = 8 orbits
Q16
B
5.60 − 2.85 = 2.75
Q17
C
3 × 7.5 = 22.5 cm
Q18
C
60 = 2×2×3×5 = 2²×3×5
Q19
C
Number = 70 × 100/35 = 200
Q20
C
2.4 × 7 = 16.8 km