CBSE Class 4 Maths Revision Worksheet Set 24

Q1. Draw where the hands will be.
a) 20 minutes before 6 o'clock
Answer: 20 minutes before 6 o'clock is 5:40.
The hour hand will be pointing slightly past 5 (towards 6), and the minute hand will be exactly on the 8.
In simple words: The time is 5:40, so the short hand is near 5 and the long hand is on 8.

Exam Tip: Remember that each number on the clock face represents 5 minutes when counted by the minute hand.

b) 30 minutes after 8 o'clock
Answer: 30 minutes after 8 o'clock is 8:30.
The hour hand will be exactly halfway between 8 and 9, and the minute hand will be on the 6.
In simple words: The time is half past 8, so both hands point to 8 (or between 8 and 9) and 6.

Exam Tip: Thirty minutes past any hour means the minute hand is pointing straight down at the number 6.

c) 45 minutes after 4 o'clock
Answer: 45 minutes after 4 o'clock is 4:45.
The hour hand will be very close to 5, and the minute hand will be on the 9.
In simple words: The time is 4:45, with the short hand near 5 and the long hand on 9.

d) 15 minutes before 12 o'clock
Answer: 15 minutes before 12 o'clock is 11:45.
The hour hand will be very close to 12, and the minute hand will be on the 9.
In simple words: The time is 11:45, meaning a quarter to 12.

Exam Tip: 15 minutes before an hour means the minute hand is pointing at the number 9.

Q2. See the following dice. The number on the opposite faces of this dice add up to 7.
a) Which number was on the opposite side of 5?
Answer: \(7 - 5 = 2\)
The number on the opposite side of 5 is 2.
In simple words: Since opposite sides add up to 7, subtract 5 from 7 to get 2.

Exam Tip: Standard dice always have opposite faces summing up to 7.

b) In the picture, which number will be at the bottom?
Answer: In the given picture, the top face shows 1.
The bottom face is opposite to 1, so it is \(7 - 1 = 6\).
In simple words: The top shows 1, so the bottom must be 6 because \(1 + 6 = 7\).

Exam Tip: Identify the top face first, then find its complement to 7.

c) Which number will you see if you turn the dice left from 5?
Answer: In the picture, 1 is on top and 4 is on the front face. 5 is on the right face. If you turn the dice left from 5, the face opposite to 5 (which is 2) will come into view, or the front face (4) shifts. Specifically, turning the dice such that the right face (5) moves to the front brings the back face to the right. Based on standard dice orientation where 1 is top and 4 is front, the left face is 3. Turning left from 5 brings 3 to the front/view.
In simple words: Turning the dice reveals the adjacent face, which is 3.

Exam Tip: Visualize the rolling or turning direction carefully based on adjacent faces.

Q3. Change into 24-hour clock time.
a) 7:30 a.m.
Answer: 0730 hours (or 07:30 hrs)
In simple words: Morning times (a.m.) remain the same, written with four digits.

Exam Tip: For a.m. times less than 10:00, add a leading zero.

b) 12:45 p.m.
Answer: 1245 hours (or 12:45 hrs)
In simple words: 12 noon hours remain 12 in 24-hour time.

Exam Tip: 12:00 noon to 12:59 p.m. does not require adding 12.

c) 2:55 p.m.
Answer: \(2:55\text{ p.m.} + 1200 = 1455\) hours
In simple words: Add 12 to any afternoon or evening p.m. time.

d) 12:05 a.m.
Answer: 0005 hours (or 00:05 hrs)
In simple words: Midnight (12:00 a.m. to 12:59 a.m.) starts with 00 in 24-hour clock.

Exam Tip: 12 midnight is written as 0000 hours.

Q.4 Fill in the blanks.
a) Any day of a month can repeat itself for maximum …………….times.
Answer: 5 times
In simple words: In a 31-day month, the first three days of the week occur 5 times.

Exam Tip: Months with 31 days have three days of the week appearing 5 times.

b) Was 2006 a leap year? …………………..
Answer: No
In simple words: 2006 is not divisible by 4, so it is a normal year with 365 days.

Exam Tip: Divide the year by 4; if it leaves a remainder, it is not a leap year.

c) A leap year comes after every …………… years.
Answer: 4 years
In simple words: Leap years occur once every 4 years.

Exam Tip: Remember the 4-year cycle for leap years.

d) 1 week = ………….. hours .
Answer: 1 week = 7 days = \(7 \times 24 = 168\) hours
In simple words: Multiply 7 days by 24 hours in a day to get 168.

Exam Tip: Calculation: \(7 \times 24 = 168\).

e) A camp started on \(14^{\text{th}}\) November. If it lasts for 20 days, it ends on ………… .
Answer: \(3^{\text{rd}}\) December
November has 30 days.
Days remaining in November after 14th = \(30 - 14 + 1 = 17\) days (including 14th).
Total camp days = 20 days.
Days needed in December = \(20 - 17 = 3\) days.
Thus, it ends on December 3.
In simple words: Count 20 days starting from November 14 to land on December 3.

Exam Tip: Always count the starting date itself when calculating duration of days.

Q.5) Draw front, side and top view of the following
a) Spoon
Answer:
- Top view: Shows the elongated oval bowl and long handle from directly above.
- Front view: Shows the profile of the spoon, highlighting the curved bowl and flat handle.
- Side view: Shows the thin edge profile with the curved scoop.
In simple words: A spoon looks like a flat oval with a stick from the top, and a curved line from the side.

Exam Tip: Visualize looking directly down (top), straight ahead (front), and from the flank (side).

b) Railway Line
Answer:
- Top view: Two parallel lines with perpendicular sleeper bars.
- Front view: A horizontal line or small cross-section profile.
- Side view: A horizontal straight line representing the tracks stretching into the distance.
In simple words: Railway tracks look like parallel lines from above and a single line from the side.

Exam Tip: Railway tracks are a classic example of parallel lines in real life.

c) A Scooter
Answer:
- Top view: Shows the handle bars, seat, footboard, and two wheels aligned.
- Front view: Shows the headlight, handlebar width, and front wheel.
- Side view: Shows the full profile of the scooter including wheels, body panel, seat, and handlebars.
In simple words: A scooter viewed from the side shows its full profile with wheels and seat.

Exam Tip: Focus on the most recognizable silhouette for side and front views.

Q6. Draw a net of a Cuboid.
Answer:
A cuboid net consists of 6 rectangular faces arranged in the shape of a cross or a connected strip of rectangles where opposite faces are identical in dimensions (length, breadth, and height).
In simple words: A cuboid net is made of 6 rectangles that can be folded together to make a box.

Exam Tip: Ensure that opposite rectangles in the net have equal dimensions.

Q7. A party started at 7:50 pm and ended at 9:30 pm. How long the party last?
Answer:
Start time = 7:50 p.m.
End time = 9:30 p.m.
Time from 7:50 p.m. to 8:00 p.m. = 10 minutes
Time from 8:00 p.m. to 9:00 p.m. = 1 hour
Time from 9:00 p.m. to 9:30 p.m. = 30 minutes
Total duration = \(1\text{ hour} + 10\text{ minutes} + 30\text{ minutes} = 1\text{ hour } 40\text{ minutes}\).
In simple words: From 7:50 to 9:30 is 1 hour and 40 minutes.

Exam Tip: Break time duration problems into hours and minutes to avoid subtraction errors with minutes.