CBSE Class 1 · Mathematics
Mango Treat (Numbers 1 to 9)
Official NCERT chapter from Joyful Mathematics (English) (book code aejm1). ExamMaster notes are original teaching at CBSE Class 1 depth.
This lesson follows the official chapter “Mango Treat (Numbers 1 to 9)” 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 1
- Easy level
- 8 concepts
1One more bird makes the next counting word
The next counting word is allowed only when one more bird (or mango) actually joins. The word is a record of that join.
Saying “six” when the new bird has not landed is a word with no job.
Figure. The next counting word is allowed only when one more bird actually lands. Five already counted; the new one is six. A word with no joiner has no job.
How it works
- See the new onePoint at the joiner.
- Say the next wordAfter five comes six.
- Stop if nothing joinedNo new word.
2Count 1 to 9 without skip or double
Each mango gets one counting word. Skip a mango and the last word is too small. Count one mango twice and the last word is too big.
The honest last word is how many are there. Fingers can help; they must still be one-to-one.
Figure. Each mango gets one word. Skip one and the last word is too small: six mangoes cannot honestly end on five. The skip box is the trap.
How it works
- Touch one mangoOne word.
- Do not skipEvery mango gets a word.
- Do not doubleNo mango gets two words.
Count a plate of mangoes
A plate holds 6 mangoes. Count them one-to-one. What last word is honest?
- First mango1
- Sixth mango6
- Last word6
Pro tip. The last word is the count. Do not add an extra “and”.
3The last counting word is how many are eating
When the last mango has a word, that word names the group. It is not a decoration on the last mango only.
“How many?” is answered by that last word, not by a new story.
Figure. When the last mango has a word, that word names the whole plate. Five is how many are eating, not a mark that belongs only to the last mango.
How it works
- Finish the lineWord on the last object.
- Keep that wordThat is the size of the group.
- Answer how manySay the last word once.
4Match a count to that many fingers
Five mangoes should raise five fingers, one per mango. A leftover finger means you counted a mango that is not there.
Fingers are a matching tool. They are not a second number system.
Figure. Five mangoes raise five fingers, one pair each. A leftover finger means you counted a mango that is not there. Fingers are a match, not a second number system.
How it works
- Raise one finger per mangoOne-to-one.
- Stop with the last mangoNo spare finger.
- Read the handThat many fingers, that many mangoes.
51 more than 4 is 5 — the join is visible
Four mangoes plus one more mango is five. You should be able to point at the new one.
“One more” is a join of one, not a magic jump to a favourite number.
Figure. Four mangoes plus one more mango is five. You should be able to point at the new one. One more is a join of one, not a jump to a favourite number.
How it works
- Start at 4A finished count of four.
- Join onePoint at the new mango.
- Say 5The next counting word.
One more than 4
A plate has 4 mangoes. One more is placed. How many now?
- Start4
- Join 14 + 1
- Last word5
Pro tip. Point at the new mango before you say five.
6Write the numeral only after the count
The mark 7 is allowed only after a group has been counted to seven. Writing 7 first and counting afterwards is backwards.
The mark is the record, not the group.
Figure. The mark 7 is allowed only after the group has been counted to seven. The digit is the record. Writing it first and counting afterwards is backwards.
How it works
- Count the groupOne-to-one, no skip, no double.
- Stop at the last objectThat last word is the count.
- Write the numeralOnly now the digit has a job.
7Order 1 to 9 on a track
1, 2, 3, … 9 is a path. Each next mark is one more than the one before. Swapping 6 and 7 breaks the path.
The track is not a decoration. It is the order of the counting words.
Figure. 1 to 9 is a path. Each next mark is one more than the one before. Swapping 6 and 7 breaks the path. Seven sits after six, not before it.
How it works
- Start at 1The first counting word.
- Place the next wordOne more each time.
- Check a swapIf two marks swapped, the path is wrong.
8Zero is the empty mango
A plate with no mango still has a count: zero. Empty is a size, not a skip.
Later, zero will hold a house open. Today it names the empty plate.
Figure. A plate with no mango still has a count: zero. Empty is a size, not a skip. The other plate has three mangoes, so its last word is three.
How it works
- Look at the plateAny mango to point at?
- If none, say zeroZero is the honest last word.
- Do not skip the plateEmpty still counts as a plate.
Notes
- The official chapter title is “Mango Treat (Numbers 1 to 9)”. 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
- The last counting word is how many.
- One more than n is the next counting word.
Recap
Hold these pegs from the official chapter “Mango Treat (Numbers 1 to 9)”. The wording is ExamMaster’s teaching, not a textbook recap.
- One more bird makes the next counting word
- The next counting word is allowed only when one more bird (or mango) actually joins.
- Count 1 to 9 without skip or double
- Each mango gets one counting word. Skip a mango and the last word is too small. Count one mango twice and the last word is too big.
- The last counting word is how many are eating
- When the last mango has a word, that word names the group.
- Match a count to that many fingers
- Five mangoes should raise five fingers, one per mango.
- 1 more than 4 is 5 — the join is visible
- Four mangoes plus one more mango is five. You should be able to point at the new one.
- Write the numeral only after the count
- The mark 7 is allowed only after a group has been counted to seven.
Practise Mango Treat (Numbers 1 to 9)
Reading is free and needs no account. Practice, mocks and progress live in the app.
- A 4-question practice set that ends the chapter
- Timed mocks scored with the real marking scheme
- Readiness tracked per topic, kept on your device