CBSE Class 4 Maths Revision Worksheet Set 16

Question 1. With the help of match stick write down the following roman numbers: 22, 50, 49, 03, 31, 18, 19, 14, 36, 20
Answer: The Roman numeral representations using matchstick structures for each number are as follows:
- 22 = XXII
- 50 = L
- 49 = XLIX
- 03 = III
- 31 = XXXI
- 18 = XVIII
- 19 = XIX
- 14 = XIV
- 36 = XXXVI
- 20 = XX
In simple words: Roman numerals are written using letters like I, V, X, L, and C, where each symbol represents a specific value and is combined by addition or subtraction.

Exam Tip: Remember basic Roman symbols: I = 1, V = 5, X = 10, L = 50. Placing a smaller numeral before a larger one means subtraction (e.g., IX = 10 - 1 = 9).

Question 2(i). See the calendar. Write any ten six digits numbers using each digit once. Find greatest number and the smallest number also.
Answer: Using the unique digits available in the June 2012 calendar grid (specifically the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9), we can form various six-digit numbers by choosing any six distinct digits for each number.
Ten sample six-digit numbers formed using each digit once per number:
1. 123456
2. 234567
3. 345678
4. 456789
5. 987654
6. 876543
7. 654321
8. 543210
9. 135790
10. 246801
Greatest number among these: 987654
Smallest number among these: 543210 (Note: If leading zeros are allowed in six-digit numbers, 012345, but standard convention requires the first digit to be non-zero, making 102343 or similar the smallest, or simply 543210 from the above set).
In simple words: A six-digit number has six places. To make the greatest number, put the largest available digits first in descending order. To make the smallest, put the smallest non-zero digits first.

Exam Tip: When forming the greatest number, arrange the given digits in descending order from left to right. For the smallest number, arrange them in ascending order ensuring the first digit is not zero.

Question 2(ii). Learn the table from 1 to 20
Answer: Multiplication tables from 1 to 20 are foundational mathematical tools required for mental arithmetic, division, factors, and multiples. Students are advised to memorize tables up to 20 \times 20 thoroughly.
In simple words: Regular practice of multiplication tables helps solve calculation problems quickly and accurately.

Exam Tip: Daily oral revision of multiplication tables for 10 minutes saves valuable time during exams.

Question 2(iii). Write the name of all triangles. Cut and paste it.
Answer: Triangles are classified based on their sides and angles:
1. Classification based on sides:
- Equilateral Triangle (All three sides are equal)
- Isosceles Triangle (Two sides are equal)
- Scalene Triangle (All three sides are of different lengths)
2. Classification based on angles:
- Acute-angled Triangle (All three angles are less than \(90^\circ\))
- Right-angled Triangle (One angle is exactly equal to \(90^\circ\))
- Obtuse-angled Triangle (One angle is greater than \(90^\circ\))
In simple words: Triangles can be named and grouped by looking at how long their sides are compared to each other, or by the size of their inner angles.

Exam Tip: Remember that the sum of all three interior angles in any triangle is always equal to \(180^\circ\).

Question 4(i). Play the snakes and ladder game. Use two dice. How many snakes are there?
Answer: Counting all the snakes shown on the standard 100-number board in the snakes and ladders game, there are 8 snakes.
In simple words: Count each snake head from the top of the board down to its tail.

Exam Tip: Carefully inspect the game board image to avoid missing any smaller snakes located near the corners.

Question 4(ii). How many ladders are there?
Answer: Counting all the ladders shown on the standard 100-number board, there are 7 ladders.
In simple words: Count each ladder starting from its bottom base up to the top.

Exam Tip: Distinguish carefully between snakes (curved creatures sliding down) and ladders (straight parallel bars climbing up).

Question 4(iii). The longest snake's head is on ..................... number.
Answer: The longest snake's head is on 99 number.
In simple words: The snake that covers the most distance from top to bottom starts near the very top of the board at 99.

Exam Tip: Look at the highest numbers near 100 to locate the head of the longest descending snake.

Question 4(iv). The longest snake's tail is on ..................... number.
Answer: The longest snake's tail is on 7 number.
In simple words: The longest snake drops all the way from 99 down to the bottom row at 7.

Exam Tip: Trace the body of the snake from the head at 99 all the way down to find its ending point.

Question 4(v). Which snake is climbing the ladder? What is the starting number of the ladder?
Answer: Snakes do not climb ladders in the game; snakes only slide down from their heads to their tails, while players climb ladders. The question is a playful riddle based on board positions. The ladder near the lower section typically starts at number 2 or 8 depending on board design.
In simple words: Snakes slide down and ladders climb up; they move in opposite directions.

Exam Tip: Read tricky board game questions carefully to separate actual game rules from imaginative prompts.

Question 4(vi). The ladder starting at 9 goes up to ..................... number.
Answer: The ladder starting at 9 goes up to 31 number.
In simple words: Following the ladder upward from 9 leads you to 31.

Exam Tip: Follow the diagonal lines of the ladder upward to find its destination number.

Question 4(vii). The snake's tail is at 24. Where is it's head.....................
Answer: The snake's head is at 56 number.
In simple words: Trace backward from the tail at 24 up the body to find where the head rests at 56.

Exam Tip: Remember that snakes take you down, so the head is always at a higher number than the tail.

Question 4(viii). The ladder starts at 28. It ends at ..................... number
Answer: The ladder starting at 28 ends at 84 number.
In simple words: Climbing up the ladder from 28 takes you directly to 84.

Question 4(ix). What do you find between 80 to 100.....................
Answer: Numbers 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, and 99.
In simple words: All the counting numbers that lie between 80 and 100.

Exam Tip: When asked what is between two numbers, list the intermediate integer values in sequence.

Question 4(x). The tail is at 19. Where is the head? .....................
Answer: The head is at 38 number.
In simple words: Following the snake from its tail at 19 up to its head leads to 38.

Exam Tip: Always double-check board coordinates by following the painted body of the snake.

Q 4. Draw the hands to show the time.

Question 4(1). Time: 6.00
Answer: Hour hand points exactly at 6 and the minute hand points at 12.
In simple words: At 6 o'clock, the short hand is on 6 and the long hand is on 12.

Exam Tip: For exact hours, the minute hand is always straight up at 12.

Question 4(2). Time: 4.30
Answer: Hour hand points halfway between 4 and 5, and the minute hand points at 6.
In simple words: At 4:30 (half past 4), the long hand is on 6 and the short hand is halfway between 4 and 5.

Exam Tip: For half-past times (30 minutes), the minute hand is always straight down at 6.

Question 4(3). Time: 2.15
Answer: Hour hand points slightly past 2, and the minute hand points at 3.
In simple words: At 2:15 (quarter past 2), the short hand is just past 2 and the long hand is on 3.

Exam Tip: Each number on the clock face represents 5 minutes (\(3 \times 5 = 15\) minutes).

Question 4(4). Time: 9.45
Answer: Hour hand points very close to 10, and the minute hand points at 9.
In simple words: At 9:45 (quarter to 10), the long hand is on 9 and the short hand is almost at 10.

Exam Tip: A quarter to the next hour means 45 minutes have passed, placing the minute hand on 9.

Question 4(5). Time: 8.45
Answer: Hour hand points very close to 9, and the minute hand points at 9.
In simple words: At 8:45, the long hand is on 9 and the short hand is nearly pointing at 9.

Exam Tip: Notice how the hour hand moves gradually toward the next hour as the minutes increase.

Question 4(6). Time: 2.45
Answer: Hour hand points nearly at 3, and the minute hand points at 9.
In simple words: At 2:45, the long hand is on 9 and the short hand is almost touching 3.

Exam Tip: 45 minutes corresponds to 9 on the clock dial (\(9 \times 5 = 45\)).

Question 4(7). Time: 6.45
Answer: Hour hand points nearly at 7, and the minute hand points at 9.
In simple words: At 6:45, the long hand is on 9 and the short hand is close to 7.

Question 4(8). Time: 2.50
Answer: Hour hand points very close to 3, and the minute hand points at 10.
In simple words: At 2:50, the long hand is on 10 (representing 50 minutes) and the short hand is nearly at 3.

Exam Tip: 50 minutes means the minute hand has reached 10 (\(10 \times 5 = 50\) minutes).