NCERT Ganita Prakash, Class 7, textbook pages 1–38 (Part 1)

How to teach Class 7 Maths Chapter 1, Large Numbers Around Us, at home

Lakhs, crores and estimating big numbers, taught with things you already have at home: a 20-minute activity, a game for the week, a 5-day plan and the mistakes to watch for.

1 crore = 100 lakh1,00,00,000= 10 million

NCERT Class 7 Maths Chapter 1 Large Numbers Around Us: what it teaches

Your child reads and writes numbers in lakhs and crores, compares the Indian and international systems, and builds a feel for size: how long is a lakh seconds, how tall is a crore coins? Estimation and rounding make big numbers usable.

Why it matters later. Large numbers and estimation are needed for science, geography and data in every later class.

See it: this chapter in pictures

Indian: 12,34,56,789International: 123,456,789same number, different commas
Two ways to group digits.
1 lakh seconds≈ 27.8 hours≈ 1.16 days
Big numbers become real when you picture them.
4,67,812nearest lakh →5,00,000
Look at the ten-thousands digit to round to lakhs.

You need

  • a newspaper or news website
  • a calculator
  • a stopwatch

Tonight’s 20 minutes

  1. Write 3,05,40,000 and read it aloud. Then write it in the international system (30,540,000).
  2. Estimate how many days make a lakh seconds, then check with a calculator (about 1.16 days).
  3. Pick three big numbers from the news and round each to the nearest lakh.
  4. Ask: roughly how many people live in your state? Find the real figure and compare.

Words to use

  • lakh
  • crore
  • million
  • billion
  • estimate
  • round off
  • place value

Watch for

  • Mixing lakh and million commas. Write both systems side by side: 10,00,000 = 1,000,000.
  • Estimates that are wildly off. Anchor to something known: a lakh is 100 thousand.

What it sounds like at home

A short example of the conversation. Your words will differ; the questions are what matter.

YouHow many lakh in a crore?

Your child100.

YouAnd a million is how many lakh?

Your child10 lakh.

YouSo a crore is how many million?

Your child10 million!

A game for this week: Guess the size

  1. One player asks a big-number question: how many seconds in a week?
  2. Each writes an estimate.
  3. Work it out together.
  4. Closest estimate scores.

A 5-day plan, 20 minutes a day

  1. Day 1Read and write lakhs and crores.
  2. Day 2Indian vs international systems.
  3. Day 3How big is a lakh? Time and length.
  4. Day 4Round big numbers.
  5. Day 5Guess the size game.

Everyday moments to practise

  • Population figures in the news.
  • Prices of flats and cars.
  • Distances to planets.
  • Cricket viewership numbers.

Quick check

Ask these at the end of the week. Tap to see the answer.

How many lakhs in a crore?

100.

1 million = ? lakh

10 lakh.

Round 4,67,812 to the nearest lakh.

5,00,000.

Ready for the next chapter when your child…

  • Reads and writes numbers in crores.
  • Converts between Indian and international systems.
  • Estimates sensibly.

Activities, wording and illustrations are Mathify Kids’ own, following the topics of NCERT’s Ganita Prakash (Class 7). See the full Class 7 parent guide for every chapter.

Questions parents ask

How many zeros in a crore?

7: 1,00,00,000.

What is 1 million in lakhs?

10 lakh.

Why learn estimation?

To check answers and make sense of big numbers in news and science.