How to Teach Percentages: From 50% to Any Percentage of an Amount

By the Success Tutoring team · October 5, 2026

Percentages are everywhere in real life: sale signs, test scores, phone batteries and download bars. That makes them one of the easiest topics to make meaningful at home. The secret to teaching percentages is to start with what “per cent” (or percent) means, link the common percentages to fractions children already know, and then use 10% and 1% as building blocks for finding any percentage of an amount.

Step 1: What “per cent” means

Per cent, also written percent, means “out of 100”. 25% means 25 out of every 100. Show this on a 100 square (a 10 × 10 grid): shade 25 squares and you have shaded 25%. Shade them all and that's 100%, the whole thing. Ask your child to shade 50%, 10% and 75%, and talk about how much of the grid each one covers.

Step 2: Link percentages to fractions and decimals

Children who know a few key equivalents can work out most everyday percentages in their heads:

Our guide on fractions, decimals and percentages explains how the three connect in more depth.

Step 3: Find 50%, 25% and 10% of an amount

Start with friendly numbers. For 80:

• 50% of 80: halve it, so 40.
• 25% of 80: halve again, so 20.
• 10% of 80: divide by 10, so 8.

The easy percentages of amounts worksheet focuses on exactly these.

Step 4: Build any percentage from 10%, 5% and 1%

Once your child can find 10%, they can build almost anything:

• Multiples of 10%: 30% of 80 is 3 × 8 = 24.
• 5% is half of 10%: 5% of 80 is 4.
• Combine them: 15% of 80 is 10% + 5% = 8 + 4 = 12.
• Subtract when it's quicker: 45% of 60 is 50% − 5% = 30 − 3 = 27.
• 1% for awkward amounts: 1% of 300 is 3, so 7% of 300 is 21.

Here is a full example: find 35% of 240.

So 35% of 240 is 84. When this feels comfortable, move on to the percentages of amounts worksheet.

A handy trick: swap the numbers

x% of y is always the same as y% of x. So 8% of 50 is the same as 50% of 8, which is 4. Children love this one, and it shows how flexible numbers can be.

Step 5: Write a score as a percentage

To turn a score into a percentage, make it “out of 100”:

• 18 out of 20: multiply both by 5 to get 90 out of 100, so 90%.
• 12 out of 25: multiply both by 4 to get 48 out of 100, so 48%.
• 7 out of 10: multiply both by 10 to get 70 out of 100, so 70%.

Step 6: Percentage increase and decrease

Sales and price rises are perfect real-life practice. Work out the percentage, then take it away or add it on:

• A game that normally costs 60 has 20% off. 20% of 60 is 12, so it now costs 48.
• A bike costs 250 and the price rises by 10%. 10% of 250 is 25, so it now costs 275.

Older children can use a single multiplication: 20% off means paying 80%, so 60 × 0.8 = 48.

Common mistakes

• Dividing by the percentage. 10% means divide by 10, but 20% does not mean divide by 20. 20% of 80 is 16, not 4.
• Thinking percentages can't go over 100%. A price can rise by 150%, and a plant can grow to 200% of its height.
• Adding discounts together. 50% off, then another 50% off the new price, is not free. 100 becomes 50, then 25.
• Forgetting what it's a percentage of. 10% of 50 is 5, but 5% of 200 is 10. The bigger percentage isn't always the bigger amount.

Everyday ways to practise

• Spot percentages in shops and work out the sale price together.
• Ask what percentage of the phone or tablet battery is left, and what fraction that is.
• Turn quiz or spelling test scores into percentages.
• Read food labels, such as “30% less sugar”, and talk about what they mean.
• Play the Money game to keep shopping math sharp.

When do children learn percentages?

Most children are introduced to percentages around Grade 5, and find percentages of amounts and solve percentage problems around Grade 6. Secure fractions, decimals and division by 10 and 100 make the topic much easier.

Frequently asked questions