Finding Percentages

In class at the moment our Maths W.A.L.T is Find percentages of given numbers
Benna and Marcel's way:

Divide the number by ten  and then work out the percentage

For Example: 15% of 92

1. 92 divided by 10 = 9.2, 
2. 50% of 9.2 =4.6 
3. 9.2 + 4.6= 13.8 

so 15% of 92= 13.8