Decimals & Percentages
1/2, 0.5 and 50% are three outfits for the same number.
Multiplying & dividing by 10, 100, 1000Decimals × whole numbersFraction–decimal–percentage equivalentsPercentages of amounts
📖 Learn
× and ÷ by 10
Digits move one place left when you × 10 and one place right when you ÷ 10.
Percent
Per cent means 'out of 100'. 35% = 35/100 = 0.35.
Finding %
10% = ÷ 10. 5% = half of 10%. Build others from these.
Worked example
Find 30% of 80
- 110% of 80 = 8
- 230% = 3 × 8 = 24 ✅
⭐ Practise
π
Ask Professor Pi
Type a question or say where you're stuck. You'll get hints, not just answers!
AI-powered tutor — it can make mistakes, so check with your teacher if unsure.