NCERT Class 2 Mathematics • Classic CBSE

Chapter 10: Add Our Points

Q: A player stands on number 14 on the snake strip board. He tosses the ball 7 times without dropping it. To add 7, he jumps 7 steps forward. On which nu

Step-by-Step Solution:• Starting point = 14• Steps forward = 7• Landing number = 14 + 7 = 21.

Q: Add the points mentally:(a) Monkey: 12 + 8 = ___(b) Deer: 15 + 13 = ___(c) Fox: 23 + 9 = ___

Answers:(a) 12 + 8 = 20(b) 15 + 13 = (15 + 10 + 3) = 25 + 3 = 28(c) 23 + 9 = (23 + 10 - 1) = 33 - 1 = 32

Q: A lizard on a wall moves between numbered holes to eat insects. From hole 0, the lizard can only walk along straight lines. Which 3 holes can the liza

Step-by-Step Solution:• Check the sum of 3, 5, 4:• 3 + 5 + 4 = 8 + 4 = 12.• The lizard can walk through holes 3, 5, and 4 (in any order) to eat 12 insects.

Q: Find 3 holes whose numbers add up to 18 using digits from: 8, 5, 2, 1, 9, 7.

Step-by-Step Solution:• Try 9 + 8 + 1: 9 + 8 = 17, 17 + 1 = 18.• Alternatively: 9 + 7 + 2 = 18.• Holes 9, 8, and 1 (or 9, 7, 2) add up to 18.

Q: Two children play a game with a 1-rupee coin. If Heads comes, they score 10 points. If Tails comes, they score 1 point.Suraj gets 3 Heads and 4 Tails.

Step-by-Step Calculation:• 3 Heads = 3 × 10 = 30 points• 4 Tails = 4 × 1 = 4 points• Suraj's total score = 30 + 4 = 34 points.

Q: Add three numbers mentally:(a) 6 + 5 + 4 = ___(b) 7 + 8 + 3 = ___

Step-by-Step Mental Strategy:(a) Make 10 first: (6 + 4) = 10; then 10 + 5 = 15.(b) Make 10 first: (7 + 3) = 10; then 10 + 8 = 18.

Q: Look at number cards: [11], [25], [17], [32]. Pick two cards that give the largest sum. Pick two cards that give the smallest sum.

Step-by-Step Solution:1. Largest sum: Pick the two largest numbers: 32 + 25 = 57.2. Smallest sum: Pick the two smallest numbers: 11 + 17 = 28.

Q: Team Red scored 46 runs. Team Blue scored 38 runs. How many more runs did Team Red score than Team Blue?

Step-by-Step Solution:• Team Red = 46 runs• Team Blue = 38 runs• Difference = 46 - 38 = 8 runs more.

Q: Calculate mentally: 33 + 14.Explain how you added without using paper and pencil.

Step-by-Step Explanation:1. Break 14 into 10 + 4.2. First add 10 to 33: 33 + 10 = 43.3. Then add the remaining 4: 43 + 4 = 47.

Q: Fill in the missing numbers to make the equations true:(a) 15 + ___ = 25(b) ___ + 8 = 20

Answers:(a) 25 - 15 = 10(b) 20 - 8 = 12

Toss the Ball, Snake Number Strip, Coin Toss & Killer Lizard | CBSE Session 2026–27

Core Pedagogical Competencies & Concepts

Mental addition of two and three single-digit and 2-digit numbers.
Using the snake number board (number strip) to count forward when adding points.
Tossing coins (Heads / Tails) and calculating running game scores.
The Killer Lizard puzzle: finding paths through numbered holes to eat insects.

All Textbook Exercises & In-Text Tasks (19 Questions)

100% Complete Ingestion

Q1 Textbook Exercise • Adding on Snake Strip

A player stands on number 14 on the snake strip board. He tosses the ball 7 times without dropping it. To add 7, he jumps 7 steps forward. On which number does he land?

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Solution:
• Starting point = 14
• Steps forward = 7
• Landing number = 14 + 7 = 21.

CBSE Step-by-Step Marking Scheme

14 + 7 shown 1 M

Landing number 21 correct 1 M

Q2 Textbook Exercise • Animal Scores Addition

Add the points mentally:
(a) Monkey: 12 + 8 = ___
(b) Deer: 15 + 13 = ___
(c) Fox: 23 + 9 = ___

[3 Marks]

✅ Step-by-Step Solution & Working

Answers:
(a) 12 + 8 = 20
(b) 15 + 13 = (15 + 10 + 3) = 25 + 3 = 28
(c) 23 + 9 = (23 + 10 - 1) = 33 - 1 = 32

CBSE Step-by-Step Marking Scheme

(a) 20 1 M

(b) 28 1 M

Q3 Textbook Exercise • Killer Lizard Puzzle

A lizard on a wall moves between numbered holes to eat insects. From hole 0, the lizard can only walk along straight lines. Which 3 holes can the lizard visit to eat exactly 12 insects if hole numbers are 3, 5, 4?

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Solution:
• Check the sum of 3, 5, 4:
• 3 + 5 + 4 = 8 + 4 = 12.
• The lizard can walk through holes 3, 5, and 4 (in any order) to eat 12 insects.

CBSE Step-by-Step Marking Scheme

Sum 3 + 5 + 4 = 12 verified 1 M

Holes 3, 5, 4 identified 1 M

Q4 Killer Lizard • Target 18

Find 3 holes whose numbers add up to 18 using digits from: 8, 5, 2, 1, 9, 7.

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Solution:
• Try 9 + 8 + 1: 9 + 8 = 17, 17 + 1 = 18.
• Alternatively: 9 + 7 + 2 = 18.
• Holes 9, 8, and 1 (or 9, 7, 2) add up to 18.

CBSE Step-by-Step Marking Scheme

Valid 3-digit combination selected 1 M

Sum 18 verified 1 M

Q5 Textbook Game • Heads and Tails

Two children play a game with a 1-rupee coin. If Heads comes, they score 10 points. If Tails comes, they score 1 point.
Suraj gets 3 Heads and 4 Tails. What is his total score?

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Calculation:
• 3 Heads = 3 × 10 = 30 points
• 4 Tails = 4 × 1 = 4 points
• Suraj's total score = 30 + 4 = 34 points.

CBSE Step-by-Step Marking Scheme

Heads (30) and Tails (4) calculated 1 M

Total 34 points correct 1 M

Q6 Three Numbers Addition

Add three numbers mentally:
(a) 6 + 5 + 4 = ___
(b) 7 + 8 + 3 = ___

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Mental Strategy:
(a) Make 10 first: (6 + 4) = 10; then 10 + 5 = 15.
(b) Make 10 first: (7 + 3) = 10; then 10 + 8 = 18.

CBSE Step-by-Step Marking Scheme

(a) 15 with make-10 strategy 1 M

(b) 18 with make-10 strategy 1 M

Q7 Two at a Time • Card Sums

Look at number cards: [11], [25], [17], [32]. Pick two cards that give the largest sum. Pick two cards that give the smallest sum.

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Solution:
1. Largest sum: Pick the two largest numbers: 32 + 25 = 57.
2. Smallest sum: Pick the two smallest numbers: 11 + 17 = 28.

CBSE Step-by-Step Marking Scheme

Largest sum: 32 + 25 = 57 1 M

Smallest sum: 11 + 17 = 28 1 M

Q8 Scoreboard Comparison

Team Red scored 46 runs. Team Blue scored 38 runs. How many more runs did Team Red score than Team Blue?

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Solution:
• Team Red = 46 runs
• Team Blue = 38 runs
• Difference = 46 - 38 = 8 runs more.

CBSE Step-by-Step Marking Scheme

Subtraction 46 - 38 shown 1 M

8 runs correct 1 M

Q9 Double Digits Mental Addition

Calculate mentally: 33 + 14.
Explain how you added without using paper and pencil.

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Explanation:
1. Break 14 into 10 + 4.
2. First add 10 to 33: 33 + 10 = 43.
3. Then add the remaining 4: 43 + 4 = 47.

CBSE Step-by-Step Marking Scheme

Mental strategy (33 + 10 + 4) explained 1 M

Answer 47 correct 1 M

Q10 Missing Addend Drill

Fill in the missing numbers to make the equations true:
(a) 15 + ___ = 25
(b) ___ + 8 = 20

[2 Marks]

✅ Step-by-Step Solution & Working

Answers:
(a) 25 - 15 = 10
(b) 20 - 8 = 12

CBSE Step-by-Step Marking Scheme

(a) 10 1 M

(b) 12 1 M

Q11 Dartboard Ring Score

Kavya throws 3 rings on a board. Her rings land on 20, 15, and 5. What is her total score?

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Calculation:
• Add: 20 + 15 + 5
• Combine 15 + 5 = 20
• Then 20 + 20 = 40 points.

CBSE Step-by-Step Marking Scheme

Grouping (15+5=20) shown 1 M

Total 40 points correct 1 M

Q12 Word Problem • Fruit Basket

A basket has 16 red apples and 18 green apples. How many apples are there in all?

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Calculation:
• Red apples = 16
• Green apples = 18
• Total = 16 + 18 = 16 + 14 + 4 = 30 + 4 = 34 apples.

CBSE Step-by-Step Marking Scheme

16 + 18 addition shown 1 M

34 apples correct 1 M

Q13 Word Problem • Stamp Album

Arjun has 28 stamps. His grandfather gifts him 15 more stamps. How many stamps does Arjun have now?

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Calculation:
• Initial stamps = 28
• Gifted stamps = 15
• Total stamps = 28 + 15 = 28 + 2 + 13 = 30 + 13 = 43 stamps.

CBSE Step-by-Step Marking Scheme

28 + 15 addition shown 1 M

43 stamps correct 1 M

Q14 Fast Math • Add 9 Strategy

What is an easy shortcut to add 9 to any number like 35?

[2 Marks]

✅ Step-by-Step Solution & Working

Explanation:
• Since 9 is just 1 less than 10, first add 10, then subtract 1.
• For 35 + 9: 35 + 10 = 45; 45 - 1 = 44.

CBSE Step-by-Step Marking Scheme

Add 10, subtract 1 shortcut explained 1 M

Example 35 + 9 = 44 shown 1 M

Q15 Comparison Problem • Game Turns

In a board game, Rohit scored 24 in round 1 and 19 in round 2. Sameer scored 21 in round 1 and 23 in round 2. Who won the match?

[2 Marks]

✅ Step-by-Step Solution & Working

Step-by-Step Solution:
• Rohit's total = 24 + 19 = 43 points.
• Sameer's total = 21 + 23 = 44 points.
• Since 44 > 43, Sameer won the match (by 1 point).

CBSE Step-by-Step Marking Scheme

Totals 43 and 44 calculated 1 M

Sameer identified as winner 1 M

Q16 True or False

State True or False:
(a) 15 + 0 = 15.
(b) Changing the order of numbers changes the sum (e.g. 7 + 9 is different from 9 + 7).

[2 Marks]

✅ Step-by-Step Solution & Working

Answers:
(a) True. Adding zero to any number leaves it unchanged.
(b) False. In addition, changing the order gives the exact same sum (7 + 9 = 16 and 9 + 7 = 16).

CBSE Step-by-Step Marking Scheme

(a) True 1 M

(b) False with commutative property explanation 1 M

Q17 Chapter Reflection

Name two strategies that make adding numbers in your head quick and easy.

[2 Marks]

✅ Step-by-Step Solution & Working

Summary:
1. Making 10s: Look for pairs that add up to 10 (like 7+3 or 6+4).
2. Breaking into Tens and Ones: Add tens first, then add the ones.

CBSE Step-by-Step Marking Scheme

Making 10s strategy named 1 M

Breaking into tens and ones named 1 M

Q18 Quick Quiz Problem

What is 25 + 25 + 25?

[1 Marks]

✅ Step-by-Step Solution & Working

Calculation:
• 25 + 25 = 50
• 50 + 25 = 75.

CBSE Step-by-Step Marking Scheme

75 correct 1 M

Q19 Textbook Game • Toss the Ball

Animals in the forest played toss-the-ball. Rabbit scored 14 in the first turn and 7 in the second turn. Tortoise scored 11 in the first turn and 12 in the second turn. Who won the game?

[3 Marks]

✅ Step-by-Step Solution & Working

Calculation:
• Rabbit's score = 14 + 7 = 21 points.
• Tortoise's score = 11 + 12 = 23 points.
• Since 23 > 21, the Tortoise won the game.

CBSE Step-by-Step Marking Scheme

Rabbit: 21 1 M

Tortoise: 23 1 M

Tortoise won 1 M

🌟 NEP 2020 Competency-Based Case Study

Jungle Animals 'Toss the Ball' Championship

Animals of the forest played 'Toss the Ball'. Each player had two turns. Bunu rabbit added their points on his snake strip board. Bear scored 16 + 7 points. Elephant scored 18 + 9 points. Tortoise scored 14 + 7 points. Bunu rabbit scored 19 + 15 points.

Analytical Task: Calculate the total points scored by each player. Who won the toss game, and who lost the game?

Evaluation & Model Answer:

1. Bear: 16 + 7 = 23 points.
2. Elephant: 18 + 9 = 27 points.
3. Tortoise: 14 + 7 = 21 points.
4. Bunu Rabbit: 19 + 15 = 34 points.
5. Winner: Bunu Rabbit (34 points).
6. Loser: Tortoise (21 points).

Rubric: 1 M for all four sums + 1 M for identifying winner (Bunu) + 1 M for identifying loser (Tortoise)