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CBSE Class 3 · Mathematics

Vacation with My Nani Maa

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 “Vacation with My Nani Maa” 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

1Play with Nani Maa still needs a repeating unit

A holiday game that asks “how long?” still needs one unit you can repeat: a hand-span, a stick, or a step.

Mixing a span and a stick in one length is two measures pretending to be one.

Figure. One length is a count of one repeating unit. Mixing a span and a stick breaks the count.

How it works

  1. Pick one unitSpan, stick, or step.
  2. Repeat it end to endNo gaps, no overlaps.
  3. Count the repeatsThat count is the length.

2Longer and shorter by direct compare

Two ribbons side by side tell longer and shorter without a number. Line up one end first.

A loose glance from across the room is not a compare.

Figure. Line up one end. The leftover stretch is what longer names. Not to scale as a stated ratio.

How it works

  1. Line up one endSame start.
  2. See which sticks outThat one is longer.
  3. If they matchSame length.

3A journey length uses the same unit end to end

Home to the well is one journey. Use the same unit from door to well. Switching units midway breaks the journey length.

“12 steps then 3 sticks” is two lengths, not one.

Figure. Home to the well is one journey. Every mark is the same step. Switching units midway is two lengths.

How it works

  1. Name the journeyDoor to well.
  2. Lock the unitSteps only, or sticks only.
  3. Count to the endOne number, one unit.

4Days of a vacation are a count of sunsets

How many days? is a count of midnights or sunsets, not a length in steps.

A long walk on day 1 is not “more days”.

Figure. Days count sunsets, not walking distance. A long walk on day 1 is still one day.

How it works

  1. Name the unitA day.
  2. Count the sunsets in the stayOne-to-one.
  3. Keep length out of itDays are not steps.

5A number without a unit is mute

“7” could be 7 steps or 7 days. Without the unit word, nobody knows which measure you ran.

Always say the unit after the number.

Figure. Seven alone is mute. The unit word picks the measure: steps or days.

How it works

  1. Finish the countThe number.
  2. Name the unitSteps, spans, or days.
  3. Speak both7 steps, not 7.

6Estimate, then measure

Guess a nearby number of units first, then run the repeating unit. The measure checks the guess.

A guess you refuse to check is not an estimate; it is a stubborn number.

Figure. Guess a nearby number of the same unit first. The measure checks the guess.

How it works

  1. Guess in the same unitAbout 10 sticks.
  2. Measure end to endCount for real.
  3. Compare guess to measureClose, or far.

Guess then count spans

A mat looks about 6 hand-spans. Measuring gives 8 spans. What was the estimate, and what is the length?

  • Estimate6 spans
  • Measure8 spans
  • Unithand-span

Pro tip. Both numbers need the same unit or they cannot meet.

7Calendar days sit in order

Monday then Tuesday is an order. You cannot swap them and keep the same week-story.

A vacation plan that jumps Thursday before Wednesday is a broken order.

Figure. Days sit in a fixed order. Thursday cannot come before Wednesday and keep the same week-story.

How it works

  1. Name todayOne calendar day.
  2. Name the nextThe next box on the calendar.
  3. Do not swapOrder is part of the count of days.

8A game can hide a join or a take-away

Marbles won are a join. Marbles given away are a take-away. The game is the story; the mark is plus or minus.

Do not add when the story is a give-away.

Figure. Won marbles join. Given-away marbles take away. Read the story before you mark plus or minus.

How it works

  1. Hear the storyWon, or given?
  2. Pick plus or minusJoin, or take-away.
  3. Compute that story onlyDo not mix them.
“12 steps then 3 sticks” for one path is
  1. Two lengths mixed, not one measure
  2. One honest length of 15
  3. A day count

One journey needs one repeating unit.

Notes

  • The official chapter title is “Vacation with My Nani Maa”. 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

  • Length = count of one repeating unit.
  • Write number + unit, never the number alone.

Recap

Hold these pegs from the official chapter “Vacation with My Nani Maa”. The wording is ExamMaster’s teaching, not a textbook recap.

Play with Nani Maa still needs a repeating unit
A holiday game that asks “how long?” still needs one unit you can repeat: a hand-span, a stick, or a step.
Longer and shorter by direct compare
Two ribbons side by side tell longer and shorter without a number.
A journey length uses the same unit end to end
Home to the well is one journey. Use the same unit from door to well. Switching units midway breaks the journey length.
Days of a vacation are a count of sunsets
How many days? is a count of midnights or sunsets, not a length in steps.
A number without a unit is mute
“7” could be 7 steps or 7 days. Without the unit word, nobody knows which measure you ran.
Estimate, then measure
Guess a nearby number of units first, then run the repeating unit.

Practise Vacation with My Nani Maa

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