Hundredths as decimals

Quick answer

Learning outcome

Success signs:

• You can say that 0.01 is the same as 1/100
• You can draw a hundred square and shade one small part
• You can use coins to show 1p is 0.01 of a pound
• You can find 0.01 in everyday things like a 100-page book or a 100-grid puzzle

Why this matters

• Measure very small amounts, like the thickness of a book or the size of a tiny insect
• Work with money – like knowing 1p is 0.01 of a pound
• Read scales and charts that show small differences
• Build strong skills for bigger maths like percentages and decimals

How it works

Here’s how it works step by step:

1. Imagine a square that is 10 by 10, so it has 100 small squares
2. One of those small squares is 1/100 of the big square
3. In decimal form, 1/100 = 0.01
4. We can also say 0.01 = 1 hundredth

Examples you can see

Let’s look at some fun examples:

Example 1: Hundred Square

Imagine a big square divided into 10 rows and 10 columns. That makes 100 small squares. If we colour just one square:

• That one square is 1/100 of the big square
• It is also 0.01 as a decimal

Example 2: Coins

Think of money:

• 100 pence = 1 pound
• 1 pence = 1/100 of a pound
• 1 pence = 0.01 pound

Example 3: Sharing Cake

Imagine a cake cut into 100 equal slices. If you eat just one slice:

• You ate 1/100 of the cake
• You ate 0.01 of the cake

Example 4: Number Line

If we draw a line from 0 to 1 and divide it into 100 equal parts:

• Each part is 0.01
• The first mark after 0 is 0.01
• The second mark is 0.02
• And so on

Try it as a mini adventure

Adventure: The 100-Grid Treasure Hunt

You are a treasure hunter! You found a map that shows a big square with 100 small squares. The treasure is hidden in one of the squares.

1. First, you need to find 1/100 of the whole square
2. That is the same as 0.01
3. Now, you must shade one small square
4. Write the decimal number for that square: 0.01
5. Next, you find 5/100 of the square
6. That is the same as 0.05
7. Shade 5 small squares
8. Write the decimal number for 5 squares: 0.05
9. Finally, you find 25/100 of the square
10. That is the same as 0.25
11. Shade 25 small squares
12. Write the decimal number for 25 squares: 0.25

Common mistakes

• Mistake: Thinking 0.1 is the same as 0.01
  Why it happens: Confusing tenths with hundredths
  Fix: Remember 0.1 = 1/10 and 0.01 = 1/100. 0.1 is ten times bigger than 0.01
• Mistake: Writing 0.001 instead of 0.01
  Why it happens: Counting the wrong number of decimal places
  Fix: Count the decimal places carefully. 0.01 has two decimal places
• Mistake: Thinking 1/100 = 0.1
  Why it happens: Mixing up the fraction and decimal
  Fix: 1/100 = 0.01. Remember: 1 hundredth = 0.01

Parent and carer guide

Help your child understand hundredths as decimals with these simple tips:

• Use coins to show how 1p = 0.01 pound
• Draw hundred squares together and colour parts
• Look for hundredths in everyday life – like pages in a book, or slices of pizza
• Practice writing 0.01, 0.02, 0.03, etc. to build confidence
• Don’t worry if they mix up 0.1 and 0.01 – it’s normal to start with this confusion
• Keep it fun and short – 5-10 minutes of practice daily is better than one long session

Practice questions

1. What is 1/100 as a decimal?
2. How do you write 0.01 as a fraction?
3. If you colour 1 square out of 100, what decimal is that?
4. What decimal is 5/100?
5. How many pence make 0.01 pound?

Answers:

1. 0.01
2. 1/100
3. 0.01
4. 0.05
5. 1 pence

FAQ

What does 0.01 mean?

0.01 means one hundredth. It is 1 part out of 100 equal parts.

Why is 0.01 the same as 1/100?

Because in decimal form, 0.01 shows that we have 1 part from 100 equal parts. It’s just another way to write 1/100.

How can I practice hundredths as decimals?

You can use hundred squares, coins, or count in steps of 0.01. Try writing 0.01, 0.02, 0.03, etc. up to 0.10.

Where can I find hundredths in real life?

You can find them in money (1p = 0.01 pound), in books (each page is 1/100 of a 100-page book), or in puzzles that have 100 pieces.

Is 0.1 the same as 0.01?

No, they are different. 0.1 is one tenth (1/10) and 0.01 is one hundredth (1/100). 0.1 is ten times bigger than 0.01.