CBSE Class 2 · Mathematics
Rani's Gift (Measurement)
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 “Rani's Gift (Measurement)” 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
1The king asked for 10 handspans — one repeating unit
Ten handspans is ten of the same hand, laid end to end. The unit is one handspan, repeated.
Switching to a foot mid-way makes the 10 mute.
Figure. Ten handspans is one unit laid end to end ten times. The first box and the last box are the same size.
How it works
- Name the unitOne handspan.
- Repeat itEnd to end, ten times.
- Refuse a swapNo foot halfway.
2A handspan must stay the same hand
The same child’s hand, the same stretch. A bigger hand mid-measure is a new unit.
The number only speaks if every span was the same size.
Figure. The count is honest only while every span is the same hand. A bigger stretch mid-way is a new unit, so “3” no longer names one size.
How it works
- Choose one handLina’s, or yours — lock it.
- Stretch it the same wayThumb to little finger.
- Finish with that handThen the count is honest.
3Length with a centimetre scale
A centimetre is a standard unit. The scale is a track of those units. Count the marks, not the pretty colour of the ruler.
Class 2 uses cm for short lengths. A bed may need metres later in this chapter.
Figure. A centimetre scale is a track of equal marks. Read the marks and keep the unit: 8 cm, not 8.
How it works
- Place the scaleAlong the object.
- Read centimetresThe unit is cm.
- Say the unit8 cm, not 8.
4Start at the zero mark, not the metal end
Some rulers have a metal bit before 0. Starting there makes every length too long.
Zero is the start of the count. The metal end is not.
Figure. Line the object with the 0 mark, not the metal cap. Starting at the cap makes every length too long.
How it works
- Find the 0 markNot the metal cap.
- Line 0 with the object’s endFlush.
- Read the other endThat mark is the length.
A pencil on a scale
The pencil’s end sits on 0. The other end sits on 12. How long is the pencil?
- Start mark0
- End mark12
- Length12 cm
Pro tip. Start at zero, not the metal end.
5Metres for longer things than a bed
A metre is 100 centimetres. A room or a corridor uses metres. A pencil does not.
Choosing cm for a corridor is allowed but clumsy. Choosing m for a pencil hides the leftover cm.
Figure. A corridor takes metres. A pencil takes centimetres. The unit has to match the size, or the leftover hides.
How it works
- Ask how long it feelsPencil, or corridor?
- Pick cm or mMatch the size.
- Keep the unit in the answer3 m, or 12 cm.
6Heavier and lighter, then a unit
A pan balance tells heavier first. A unit (the same block) can wait until the compare is clear.
A kilogram name without a compare is a later, finer story. The compare comes first.
Figure. The side that goes down is heavier. Name heavier and lighter before you reach for a kilogram block.
How it works
- Two pansOne object each.
- Which side goes downHeavier.
- Then, if needed, a unitSame block, again.
7Holds more or holds less
A jug holds more than a cup if the cup’s water fits with room left. Height is not the test.
A tall thin bottle can hold less than a short wide one.
Figure. Pour the cup into the jug. Room left means the jug holds more. A tall thin bottle can still hold less.
How it works
- Fill the smallerPour into the larger.
- Ask if room remainsRoom left means holds more.
- Ignore which looks tallerFill-test wins.
8A number without a unit is mute
“The mat is 6” does not say 6 handspans or 6 cm. The unit must ride with the number.
Always say the unit after the number.
Figure. Six what? A number without a unit does not name a length. Write 6 cm, not 6.
How it works
- Write the count6.
- Write the unitHandspans, or cm.
- Read both6 cm, not 6.
Start a scale at
- The zero mark
- The metal end
- The middle
Zero is the start of the count.
Notes
- The official chapter title is “Rani's Gift (Measurement)”. 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
- Start a scale at 0, not the metal end.
- 1\,\mathrm{m} = 100\,\mathrm{cm}.
Recap
Hold these pegs from the official chapter “Rani's Gift (Measurement)”. The wording is ExamMaster’s teaching, not a textbook recap.
- The king asked for 10 handspans — one repeating unit
- Ten handspans is ten of the same hand, laid end to end.
- A handspan must stay the same hand
- The same child’s hand, the same stretch. A bigger hand mid-measure is a new unit.
- Length with a centimetre scale
- A centimetre is a standard unit. The scale is a track of those units. Count the marks, not the pretty colour of the ruler.
- Start at the zero mark, not the metal end
- Some rulers have a metal bit before 0. Starting there makes every length too long.
- Metres for longer things than a bed
- A metre is 100 centimetres. A room or a corridor uses metres. A pencil does not.
- Heavier and lighter, then a unit
- A pan balance tells heavier first. A unit (the same block) can wait until the compare is clear.
Practise Rani's Gift (Measurement)
Reading is free and needs no account. Practice, mocks and progress live in the app.
- A 4-question practice set that ends the chapter
- 1 quick check with worked explanations
- Timed mocks scored with the real marking scheme
- Readiness tracked per topic, kept on your device