Samacheer Kalvi Class 4 Maths Solutions Term 3 Chapter 4 Time Exercise 4.1

Question 1. Find out the days between manufacturing and expiry date of a medicine given below.
Answer:
The manufacturing date of the medicine is July 9, 2013.
The expiry date of the medicine is July 8, 2016.
To find the duration, we calculate the time from the manufacturing date to the expiry date.
From July 9, 2013, to July 8, 2016, is almost exactly 3 years. Medicines have an expiry date to ensure they are safe and effective.
In simple words: The medicine was made on July 9, 2013, and expires on July 8, 2016. The time between these two dates is 3 years.

🎯 Exam Tip: Always pay close attention to the exact day, month, and year when calculating time periods, especially for manufacturing and expiry dates, as even a single day can be crucial.

Question 2. Select a month in the calendar and find out any creative pattern of your own in the numbers.
Answer:
Let's use the provided calendar for a month:
1 8 15 22 29
2 9 16 23 30
3 10 17 24 31
4 11 18 25
5 12 19 26
6 13 20 27
7 14 21 28
One pattern observed is that if you go down one step in any column, the number increases by 7. For example, in the first column, 1 + 7 = 8, 8 + 7 = 15, and so on. This happens because there are 7 days in a week.
In simple words: Pick any number in the calendar grid. The number directly below it is always 7 more than the one above it. This is because a week has seven days.

🎯 Exam Tip: When looking for patterns in a calendar, try adding or subtracting numbers diagonally, horizontally, or vertically. Common patterns include adding 7 for vertical movement or observing sums in small squares.