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CBSE Class 3 · Mathematics

Raksha Bandhan

Official NCERT chapter from Maths Mela (book code cemm1). ExamMaster notes are original teaching at CBSE Class 3 depth.

This lesson follows the official chapter “Raksha Bandhan” in Maths 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 3
  • Easy level
  • 8 concepts

1A festival house has counted decorations

Rakhis, sweets, or diyas are ones you can count. The festival name does not replace the count.

“Many decorations” is not a numeral.

Figure. Rakhis and sweets are ones you can count. The last counting word is the size. “Many decorations” names no numeral, so it is not yet a count.

How it works

  1. Name the pileRakhis, or sweets.
  2. Count one-to-oneLast word is the size.
  3. Write the numeralBeside that pile.

2Join groups of rakhis or sweets

Sweets already on the plate plus sweets that arrive is a join. Write plus only after you can say they joined.

Two piles that never meet are not a join.

Figure. Sweets already on the plate plus sweets that arrive is a join. Four and three meet as seven only after both piles have been counted. Two piles that never meet are not a join.

How it works

  1. Count the start pileOn the plate.
  2. Count the arriving pileThe new group.
  3. AddThat sum is how many now.

3Take away the ones that were given

Rakhis tied and given away leave the box. That is a take-away, not a join.

Do not add when the story is a gift leaving.

Figure. A box of 48 sweets with 15 given away leaves 33. Given is the leaving part, so the story is take-away. Check: 33 + 15 rebuilds 48.

How it works

  1. Count the startIn the box.
  2. Count what leftGiven away.
  3. SubtractWhat remains.

Sweets given

A box holds 48 sweets. 15 are given to cousins. How many remain?

  • Start48
  • Given15
  • Remain48 − 15 = 33

Pro tip. Given away is minus. Check: 33 + 15 = 48.

4A picture is a story of join or take away

Arrows in, arrows out. Read the picture as plus or minus before you compute.

A pretty border is not the operation.

Figure. Read the picture as a story before you compute. An arrow in is a join. An arrow out is a take-away. A pretty border is not the operation.

How it works

  1. See what arrives or leavesThe story.
  2. Pick + or −Join or take-away.
  3. Then computeThe mark matches the story.

5Regroup ten ones as one ten

When ones pass nine, trade ten ones for one ten. The festival pile still has the same total.

Writing 14 ones in the ones house is an unfinished trade.

Figure. Fourteen ones in the ones house is an unfinished trade. Bundle ten ones as one ten, and leave 4 in the ones house. The pile still has the same total, 14.

How it works

  1. Add the onesSee if they reach 10.
  2. Trade 10 ones → 1 tenMove to the tens house.
  3. Leave leftover ones0 to 9.

6Estimate first by tens

48 + 15 is near 50 + 10 = 60. Estimate by nearby tens, then compute exactly.

An estimate is a neighbour, not a replacement for the exact sum if you need it.

Figure. 48 + 15 is near 50 + 10 = 60. Mark 48 next to its neighbour ten, estimate, then compute the exact 63. An estimate is a neighbour, not a replacement when you need the exact sum.

How it works

  1. Round each to a nearby ten48 → 50, 15 → 10 or 20.
  2. Add thoseA neighbour total.
  3. Then compute exactlyCheck you are close.

7Check by the opposite action

After 48 − 15 = 33, check 33 + 15 = 48. The opposite action must rebuild the start.

A check that uses a new story is not a check.

Figure. After 48 − 15 = 33, join 15 back. The opposite action must rebuild 48. A check that starts a new story is not a check.

How it works

  1. Keep the result33.
  2. Do the oppositeAdd what you subtracted.
  3. Demand the start48, or redo.

8The festival name does not change the arithmetic

Raksha Bandhan is the setting. Plus and minus are the same operations you use on a school day.

Do not invent a special festival plus.

Figure. Raksha Bandhan is the setting. Plus and minus are the same operations you use on a school day. 8 + 5 is 13 in both pictures. The festival does not invent a new plus.

How it works

  1. Name the numbersSizes of piles.
  2. Name the storyJoin or give.
  3. Use ordinary + or −The festival is the picture, not a new rule.
48 sweets, 15 given. The check of 33 remaining is
  1. 33 + 15 = 48
  2. 33 − 15 = 18
  3. 48 + 15 = 63

The opposite of take-away is a join back to the start.

Notes

  • The official chapter title is “Raksha Bandhan”. 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

  • Join: start + new = now.
  • Take-away: start - given = remain.
  • Check: remain + given = start.

Recap

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

A festival house has counted decorations
Rakhis, sweets, or diyas are ones you can count.
Join groups of rakhis or sweets
Sweets already on the plate plus sweets that arrive is a join.
Take away the ones that were given
Rakhis tied and given away leave the box. That is a take-away, not a join.
A picture is a story of join or take away
Arrows in, arrows out. Read the picture as plus or minus before you compute.
Regroup ten ones as one ten
When ones pass nine, trade ten ones for one ten.
Estimate first by tens
48 + 15 is near 50 + 10 = 60. Estimate by nearby tens, then compute exactly.

Practise Raksha Bandhan

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