What decimal number is illustrated?
key notes :
🔍 Understanding Decimal Models
- Decimals can be shown using grids, blocks, number lines, or money models 💰
- Each model represents parts of a whole (1) 🧩
🟥🟦 Base-Ten Blocks Representation
| Block | Value | Example |
|---|---|---|
| 🟦 Large Square | 1 whole = 1.0 | 2 squares = 2.0 |
| 🔶 Long Rod | One-tenth = 0.1 | 3 rods = 0.3 |
| 🟨 Small Cube | One-hundredth = 0.01 | 5 cubes = 0.05 |
👉 Add them to find the decimal number
Example: 1 square + 4 rods + 7 cubes = 1.47 ✨
🟩📊 100-Grid Model (Hundred Chart)
- A full grid shaded = 1.00 ✅
- 1 square shaded in the grid = 0.01
- 10 squares shaded = 0.10
Example: If 36 squares are shaded → 0.36 🎯
📍📏 Decimal on a Number Line
- Between 0 and 1 we divide the line into 10 equal parts for tenths (0.1)
- Each tenth can be divided into 10 smaller parts for hundredths (0.01)
🧠 Example: A point between 0.4 and 0.5 at the 3rd small line = 0.43 🧮
💰🪙 Money Model
- ₹1 = 1.00
- 10 paise = 0.10
- 1 paise = 0.01
Example: ₹1 + 30p + 5p = ₹1.35 ➡️ 1.35 as a decimal
🧠💡 Key Strategy to Read Illustrated Decimals
✅ Count the wholes
✅ Count the tenths
✅ Count the hundredths
➕ Add them together to get the decimal
🎉 Example Problem
If the model shows:
- 2 wholes
- 5 tenths
- 9 hundredths
Decimal number = 2.59 🌈
🏁 Final Tip
🔸 Decimals show parts of a whole
🔸 Always check if the illustration represents tenths or hundredths
🔸 Write the value correctly using the decimal point ✏️
Learn with an example
What decimal number is illustrated?
There are 100 squares. There are 22 coloured squares. This picture shows twenty-two hundredths.
Now write twenty-two hundredths as a decimal. Use a place value chart.
| ones | tenths | hundredths | |
| 0 | . | 2 | 2 |
The answer is 0.22.
What decimal number is illustrated?
There are 100 squares. There are 62 colored squares. This picture shows sixty-two hundredths.
Now write sixty-two hundredths as a decimal. Use a place value chart.
The answer is 0.62.
What decimal number is illustrated?
There are 100 squares. There are 21 coloured squares. This picture shows twenty-one hundredths.
Now write twenty-one hundredths as a decimal. Use a place value chart.
| ones | tenths | hundredths | |
| 0 | . | 2 | 1 |
The answer is 0.21.
Let’s practice!
