where possible. The LCM of 5 and 10 is 10. 3⁄5 is equivalent to 6⁄10. 1⁄10 already has a denominator of 10 so does not need to change. The simplest approach is to add the improper fractions ...

These are the numbers that are multiples of both 4 and 5. The LCM is therefore 20, as this is the lowest of all the common multiples. Find the LCM of 6 and 10. If we write out the 6 times table ...