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CBSE Class 4 · Mathematics

Thousands Around Us

Official NCERT chapter from Math-Mela (book code demm1). ExamMaster notes are original teaching at CBSE Class 4 depth.

This lesson follows the official chapter “Thousands Around Us” in Math-Mela. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.

  • CBSE Class 4
  • Easy level
  • 8 concepts

1A langar estimate is a thousands-house count

“About a thousand plates” is a compare to one thousand-bundle. It is not yet 1,000 exactly.

Treat it as a first compare, then finish the houses if you need the exact numeral.

Figure. An estimate for a community lunch is a thousands-house count: about three thousand plates. Ones and tens stay unmarked until you finish bundling.

How it works

  1. Name the benchmarkOne thousand.
  2. Ask more, less, or aboutA compare.
  3. Count houses if you need exactGuess is not the numeral.

2Thousand is ten hundreds

Ten finished hundreds trade for one thousand. That thousand opens the thousands house (Th).

Nine hundreds are not a thousand.

Figure. Ten hundred-bundles are one thousand-bundle. The digit 1 in the thousands house is that bundle, not a taller 1.

How it works

  1. Make ten hundredsEach hundred is 100.
  2. Trade for 1 thousandNew house.
  3. Write 1 in thousandsHundreds, tens, ones may still have leftovers.

3Read 3,406 by houses

3,406 is 3 thousands, 4 hundreds, 0 tens, 6 ones. The comma is a reading mark, not a plus.

The 3 is not 3 ones.

Figure. Read 3,406 house by house: 3 thousands, 4 hundreds, 0 tens, 6 ones. The zero is a house, not a skip.

How it works

  1. Thousands3 → 3,000.
  2. Hundreds4 → 400.
  3. Tens and ones0 tens, 6 ones.

Read 2,508 by houses

Write 2,508 as thousands, hundreds, tens, and ones.

  • Thousands2
  • Hundreds5
  • Tens0
  • Ones8
  • Value2000 + 500 + 8

Pro tip. Left house first. Zero holds the tens house open.

4Compare from the thousands house first

4,120 and 3,980: thousands 4 > 3, so 4,120 is more. You do not need the ones yet.

Comparing ones first can lie when thousands differ.

Figure. Compare from the thousands house. Both numbers have 4 thousands, so the hundreds house decides: 5 hundreds beat 2 hundreds.

How it works

  1. Look at thousandsDifferent? Stop there.
  2. If equal, look at hundredsNext house.
  3. Then tens, then onesLast houses.

5Zero holds a house open

In 3,406 the 0 says “no tens”, but ones still sit in ones. Writing 346 would slide the digits.

Zero is a holder, not a skip of the house.

Figure. Zero holds the tens house open in 405. Take it out and the same ink becomes 45 — a different number, not a neater 405.

How it works

  1. Read each houseTh, H, T, O.
  2. If a house is emptyWrite 0 there.
  3. Do not drop the houseDropping it moves the digits.

6Bundle hundreds to make the next thousand

After 9 hundreds, one more hundred makes the next thousand. Crossing 2,999 + 1 is 3,000, a house change.

Writing 10 in the hundreds house is an unfinished trade.

Figure. Ten in the hundreds house is not a legal digit. Bundle them: the thousands house gains 1 and hundreds returns to 0.

How it works

  1. See 9 hundredsAlmost the next thousand.
  2. Add one hundredTrade up.
  3. Write the new thousands digit3,000, 4,000, …

7A community lunch is the story; the houses are the maths

A neighbourhood meal is the picture. Thousands, hundreds, tens, ones are the read.

Do not let the story replace the house-read.

Figure. The lunch is the story. The maths is the four houses: 2,480 plates means 2 thousands, 4 hundreds, 8 tens, 0 ones.

How it works

  1. Keep the settingA large meal.
  2. Find the numberThe houses.
  3. Answer with the housesThe story is not the size.

8A guess is not a count until the bundles finish

“Looks like more than 2,000” can start you. The count ends when Th, H, T, O are finished.

Stopping at the guess leaves a house unread.

Figure. A guess of 5000 is allowed as a first look. The numeral 4,720 waits until the thousands and hundreds bundles are actually counted.

How it works

  1. Allow a first guessAbout a thousand, or not.
  2. Then bundleOnes → tens → hundreds → thousands.
  3. Write the four-digit numeralThat is the count.
In 3,406 the digit 3 names
  1. 3 thousands
  2. 3 hundreds
  3. 3 ones

Left house is thousands.

Notes

  • The official chapter title is “Thousands Around Us”. Teach the school test for that title, not a contest shortcut.
  • If a step needs a later class, stop. The next official chapter will pick it up.

Formulas

  • 1000 = 10 hundreds.
  • 3406 = 3\times 1000 + 4\times 100 + 0\times 10 + 6.
  • Compare four-digit numbers from the thousands house first.

Reference tables

Read left to right. Each digit names its house.

Houses in 3,406 and 2,508
ThousandsHundredsTensOnesNumber
34063406
25082508
10001000
40004000

Recap

Hold these pegs from the official chapter “Thousands Around Us”. The wording is ExamMaster’s teaching, not a textbook recap.

A langar estimate is a thousands-house count
“About a thousand plates” is a compare to one thousand-bundle.
Thousand is ten hundreds
Ten finished hundreds trade for one thousand.
Read 3,406 by houses
3,406 is 3 thousands, 4 hundreds, 0 tens, 6 ones.
Compare from the thousands house first
4,120 and 3,980: thousands 4 > 3, so 4,120 is more.
Zero holds a house open
In 3,406 the 0 says “no tens”, but ones still sit in ones.
Bundle hundreds to make the next thousand
After 9 hundreds, one more hundred makes the next thousand.

Practise Thousands Around Us

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