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It is 10 so that 2/5 + 1/2 becomes 4/10 + 5/10 = 9/10
The LCM of 5 and 10 is 10, but those are the same fraction so if you reduced 2/10 to 1/5, you could use 5.
by dividing or multiplying the numerator and the denominator of a fraction with the same numberex:* 1/2 = (1 x 5)/(2 x 5) = 5/10(multiples both numerator and denominator with 5)1/2 and 5/10 are equivalent fractions* 14/35 = (14:7)/(35:7) = 2/5(divide both numerator and denominator with common factor of 14 and 35)14/35 and 2/5 are equivalent fractions
The Least Common Multiple (LCM) for 10 5 2 is 10.
2 x 5 = 10