Drills

Maths drill

Decimal → Fraction

Count the decimal digits — that's how many zeros go on the bottom.

How it works

  • 1Count the digits after the decimal point.
  • 2That count = the zeros on the bottom: 1 digit → 10, 2 digits → 100, 3 digits → 1000.
  • 3The digits themselves go on top: 0.4 = 4/10, 0.35 = 35/100, 0.196 = 196/1000.
  • 4Ends in a zero? Knock a zero off top AND bottom: 250/1000 → 25/100 → 5/2 style — keep going as long as both end in 0.
  • 5Percents are easy too: 22% = 22/100. A decimal in the percent? ×10 both parts: 23.6% = 236/1000.

Worked example

0.35 → fraction
2 digits after the point → /100
0.35 = 35/100
Simplify if you like: 7/20