RRB ALP CBT I 13 Feb 2026 Shift 1 Paper

Concept:For decimals with different decimal places, convert them into fractions with a common denominator, then use the formula: LCM of decimals = LCM of numerators ÷ HCF of denominators.Explanation:Write each decimal with the same number of decimal places.$1.3 = 1.30$, $7.6 = 7.60$, and $0.13$ stays as $0.13$.Convert to fractions with denominator $100$:$1.3 = \frac{130}{100}$, $7.6 = \frac{760}{100}$, $0.13 = \frac{13}{100}$.Now find LCM of the numerators: $130$, $760$, and $13$.Prime factorisations:$130 = 2 \times 5 \times 13$$760 = 2^3 \times 5 \times 19$$13 = 13$LCM $= 2^3 \times 5 \times 13 \times 19 = 8 \times 5 \times 13 \times 19 = 9880$.Since the common denominator is $100$, divide the LCM by $100$:$\frac{9880}{100} = 98.8$Answer:The LCM is $98.8$, which is Option D.