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CBSE Class 2 · Mathematics

Fun with Numbers (Numbers 1 to 100)

Official NCERT chapter from Joyful Mathematics (English) (book code bejm1). ExamMaster notes are original teaching at CBSE Class 2 depth.

This lesson follows the official chapter “Fun with Numbers (Numbers 1 to 100)” in Joyful Mathematics (English). 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 2
  • Easy level
  • 8 concepts

1A ginladi is a bead track you can count

Each bead is one. The string is a track. Count along the string, not by shaking the bunch.

A skipped bead makes the last word too small.

Figure. A ginladi is a bead track. Touch one bead, say one counting word, follow the string. The five filled beads are counted; the three empty seats are still on the track. Shaking the bunch skips seats and makes the last word too small.

How it works

  1. Touch one beadOne word.
  2. Follow the stringNo skip, no double.
  3. Keep the last wordThat is how many beads.

2Blank cards wait for the next counting word

A blank card is a seat for the next number. Filling it with a favourite mark is not counting.

The next card is the next counting word after the one you just placed.

Figure. A blank card is a seat for the next counting word. After 23 the next word is 24, not a favourite mark and not a jump to 25. The highlighted card is empty on purpose.

How it works

  1. See the last filled cardThat number is known.
  2. The blank wants the next wordOne more.
  3. Write only that wordNo jump of ten unless the ones filled.

3Numbers to 100 as tens and ones

Every number to 100 uses a tens house and an ones house. 64 is 6 tens and 4 ones.

100 will be ten tens — a new house. Until then, two houses.

Figure. 64 lives in two houses: 6 in tens means sixty, 4 in ones means four. Read both: sixty-four, not “6 and 4” as two ones. 60 + 4 = 64.

How it works

  1. Point at tensThe left digit.
  2. Point at onesThe right digit.
  3. Read bothSixty-four, not “6 and 4” as two ones.

Read 64 by houses

What does 64 name?

  • 6 in tens60
  • 4 in ones4
  • 60 + 464

Pro tip. Say the house before you add.

4A hundred is ten tens

Ten full boxes of ten make one hundred. It is not “1 and 00” as three ones.

The two zeros hold the tens and ones houses open so the 1 can sit in hundreds.

Figure. Ten full boxes of ten make one hundred. It is not “1 and 00” as three ones. The two zeros in 100 hold the tens and ones houses open so the 1 can sit in hundreds.

How it works

  1. Make ten tensTen boxes.
  2. Bundle themThat bundle is 1 hundred.
  3. Read 1001 hundred, 0 tens, 0 ones.

5Place-value houses

Ones, tens, and — at 100 — hundreds. A digit’s value is the house it sits in.

Move a 6 from ones to tens and the same ink means sixty.

Figure. A digit’s value is the house it sits in. In 100 the 1 sits in hundreds; the two zeros keep tens and ones open. Move a 6 from ones to tens and the same ink means sixty.

How it works

  1. Name the housesOnes, tens, hundreds if you have 100.
  2. Read each digit in its house“Six tens”, not “six”.
  3. Rebuild the totalAdd the house values.

6Compare two two-digit numbers

Compare tens first. 72 beats 58 because 7 tens beat 5 tens. Ones wait.

If tens match, then ones decide. 72 and 75 share 7 tens; 5 ones beat 2 ones.

Figure. Compare tens first. 72 beats 58 because 7 tens beat 5 tens — ones wait. If tens had matched, ones would decide. The longer bar is the larger number because tens already settled it.

How it works

  1. Compare tensDifferent? Stop.
  2. If tens match, compare onesThe leftover decides.
  3. Name the largerThe first house that differs.

7Order on the ginladi, then on a hundred chart

The string order is the counting-word order. The hundred chart is the same order in rows of ten.

A swap on the chart is the same lie as a swap on the string.

Figure. The ginladi order is the counting-word order. The hundred chart is that same order in rows of ten. After 10 the next word is 11, one row down — a jump of ten, not a new alphabet. A swap on the chart is the same lie as a swap on the string.

How it works

  1. Follow the stringNext bead, next word.
  2. Find that word on the chartSame order.
  3. Check a neighbourOne more, or one ten more if you move a row.

8Write the number before and after

Before 47 is 46. After 47 is 48. A jump of one does not skip a house unless ones were 0 or 9.

Before 40 is 39: ones were 0, so you unwrap a ten.

Figure. Stand on 47. One less is before: 46. One more is after: 48. A jump of one does not skip a house unless ones were 0 or 9 — before 40 is 39 because you unwrap a ten.

How it works

  1. Stand on the number47.
  2. One less is before46.
  3. One more is after48.
Compare 72 and 58 first at
  1. The tens house
  2. The ones house
  3. The colour

7 tens beat 5 tens.

Notes

  • The official chapter title is “Fun with Numbers (Numbers 1 to 100)”. 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

  • A two-digit number is (tens\times 10) + ones.
  • 100 is ten tens.

Reference tables

A digit’s value is the house it sits in.

Houses up to 100
NumberHundredsTensOnes
64064
100100
40040

Recap

Hold these pegs from the official chapter “Fun with Numbers (Numbers 1 to 100)”. The wording is ExamMaster’s teaching, not a textbook recap.

A ginladi is a bead track you can count
Each bead is one. The string is a track. Count along the string, not by shaking the bunch.
Blank cards wait for the next counting word
A blank card is a seat for the next number.
Numbers to 100 as tens and ones
Every number to 100 uses a tens house and an ones house.
A hundred is ten tens
Ten full boxes of ten make one hundred. It is not “1 and 00” as three ones.
Place-value houses
Ones, tens, and — at 100 — hundreds. A digit’s value is the house it sits in.
Compare two two-digit numbers
Compare tens first. 72 beats 58 because 7 tens beat 5 tens. Ones wait.

Practise Fun with Numbers (Numbers 1 to 100)

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