Decimal Place Value
Comprehensive notes, formulas, and practice questions for Decimal Place Value.
Decimal Place Value
Decimal Place Value
What you'll learn
- How decimal notation extends the Indian place-value system to tenths, hundredths, and thousandths after the decimal point.
- To read and write decimals in money (₹ and paise) and measurement (metres, centimetres, kilograms).
- To express decimals in expanded form and compare digit values by place.
- To link decimals with fractions — especially tenths and hundredths from NCERT Math-Magic 5, Chapter 10 (Tenths and Hundredths).
Key concepts
Level 1 — Place value after the decimal point
Verbal: Each digit after the decimal point has a place value ten times smaller than the digit to its left.
Symbolic: In 6.408 → 6 ones, 4 tenths (0.4), 0 hundredths, 8 thousandths (0.008).
| Place | Value | Fraction form | Example digit in 6.408 |
|---|---|---|---|
| Ones | 1 | — | 6 |
| Tenths | 1/10 = 0.1 | 1/10 | 4 → 0.4 |
| Hundredths | 1/100 = 0.01 | 1/100 | 0 → 0.00 |
| Thousandths | 1/1000 = 0.001 | 1/1000 | 8 → 0.008 |
NCERT link (Math-Magic 5, Ch 10): Price tags like ₹45.75 and lengths like 1.7 m appear throughout Tenths and Hundredths.
Level 2 — Money, expanded form, and trailing zeros
Verbal: 100 paise = ₹1, so 50 paise = ₹0.50 = fifty hundredths of a rupee.
Symbolic: ₹12.50 = 12 + 0.5 = 12 + 50/100; 2.34 = 2 + 0.3 + 0.04.
| Representation | Meaning |
|---|---|
| ₹45.75 | 45 rupees + 75 paise |
| 0.6 = 0.60 | Trailing zero does not change value |
| 4.07 | Zero holds the hundredths place — not 4.7 |
Real-life: A notebook costs ₹35.00; a pen ₹12.50; total ₹47.50 — read each place before paying.
Worked example
Read ₹127.05 and write it in expanded decimal form.
Step 1 — Whole part: 127 rupees.
Step 2 — Decimal part: 0.05 = 0 tenths + 5 hundredths = 5 paise.
Step 3 — Expanded: 100 + 20 + 7 + 0 + 0.05.
Answer: One hundred twenty-seven rupees and five paise.
In 6.408, which digit is in the hundredths place?
Step 1 — After decimal: 4 = tenths, 0 = hundredths, 8 = thousandths.
Answer: The digit 0 is in the hundredths place (value 0.00).
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| 0.7 and 0.07 are the same | Ignoring place value | 0.7 = 7 tenths; 0.07 = 7 hundredths — very different |
| Writing 4.7 for "four and seven hundredths" | Dropping the zero placeholder | Write 4.07 — zero keeps hundredths position |
| More decimal digits → always larger | Counting digits, not place value | Compare from left; 0.9 > 0.099 |
| ₹12.5 read as twelve rupees five paise | Missing trailing zero meaning | ₹12.50 = 12 rupees 50 paise |
Quick check
- Write nine hundredths as a decimal. (0.09)
- Express 3 + 0.2 + 0.05 as one decimal. (3.25)
- In 8.306, what is the value of the digit 3? (3 tenths = 0.3)
- Which is greater: 0.6 or 0.59? Explain using place value.
- Stretch: ₹100 − ₹45.75 = ? Write the answer in rupees and paise. (₹54.25)
Revision tip: Draw a place-value chart with columns Ones · Tenths · Hundredths · Thousandths. Write three price tags from your home (₹) and label each digit's value.
Open the Practice tab for graded questions on Decimal Place Value.
Interactive Exploration Suggestions (Drishti Live Worlds)
- Use the platform-native live simulation or PhET-style tool for this topic (number line, Venn, physics playground, molecule builder, sensor dashboard, etc.).
- Mirror / body / home activity: physically do the concept (count objects, measure, role-play) and photograph or describe for portfolio.
- Voice or text reflection with AI Mentor: explain the concept to a younger student or family member.
AI Mentor Prompts (Socratic, Board-Adaptive)
- "Explain this concept to a Class 6 student using one real example from an Indian home, school, market, or festival."
- "What is one common mistake students make here, and how would you catch yourself making it?"
- Stretch: "How does this connect to coding, robotics, money, health, environment, or a future career?"
Gamification, Portfolio & Parent Visibility
- Complete the core practice + one extension activity (photo, table, short reflection, or mini-project) for base XP + topic badge.
- 5-7 day streak or family discussion note = multiplier + visible artifact in parent/principal dashboard.
- Best real-world application stories (anonymised) featured on class or national leaderboard.
Robotics, STEM & Future Skills Bridges
- One hands-on project or measurement using the Drishti kit or household items that makes the concept physical.
- Direct link to at least one Future Skill track (Money Management, Green Tech, Cyber Defenders, Micro-Entrepreneurship, AI Mastery, Sustainable Living, Personality Development).
- Coding extension where relevant (simple script, simulation, or data logging).
NEP 2020 & Full Education OS Alignment
This material emphasises experiential "learning by doing", competency (apply/create/analyse), vocational exposure, critical thinking, and multidisciplinary connections. Designed to feed live worlds, AI Mentor (with memory), gamification, robotics, parent analytics, and future skills — not just exam prep.
Portfolio Evidence Idea: Your photo/table/reflection/project + one sentence on "How this helps me in real life or a possible future path."
Open the Practice tab for aligned questions (easy/medium/hard + case-based) with full AI scaffolding.
See curriculum for cross-links and the full future-skills/robotics chapters.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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