n ÷ 5
The trick, step by step
Double it: 235 × 2 = 470.
Divide by 10: 470 ÷ 10 = 47.
given working answer taken away
Why it works
5 = 10 ÷ 2, so dividing by 5 is the same as dividing by 10 and multiplying by 2, in either order.
Practise this trickTricks · Dividing and percentages
Divide by 5
Dividing a multiple of 5 by 5, such as 235 ÷ 5.