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Chapter 12 of 15
Flashcards

Racing Seconds

CBSE · Class 5 · Mathematics

Flashcards for Racing Seconds — CBSE Class 5 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.

45 questions20 flashcards5 concepts
20 Flashcards
Card 1Time Conversion

How many seconds are there in 1 minute?

Answer

1 minute = 60 seconds. This is a fundamental conversion for measuring time. For example, if someone takes 1 minute 30 seconds to complete a task, that equals 90 seconds in total.

Card 2Time Format Conversion

Convert 05:30 a.m. to 24-hour format

Answer

05:30 hours. In 24-hour format, morning times (a.m.) remain the same from 1:00 to 12:00, but we write them as 01:00 to 12:00. Since 5:30 a.m. is in the morning, it stays 05:30 hours.

Card 3Time Format Conversion

Convert 02:30 p.m. to 24-hour format

Answer

14:30 hours. For afternoon/evening times (p.m.), add 12 to the hour. 2:30 p.m. becomes 2 + 12 = 14:30 hours. The minutes remain the same.

Card 4Elapsed Time

Calculate elapsed time from 01:15 p.m. to 01:42 p.m.

Answer

27 minutes. To find elapsed time within the same hour: 42 minutes - 15 minutes = 27 minutes. Since both times are in the same hour (1 p.m.), we only subtract the minutes.

Card 5Elapsed Time

Calculate elapsed time from 09:15 a.m. to 11:30 a.m.

Answer

2 hours 15 minutes. Method: From 9:15 a.m. to 10:15 a.m. = 1 hour. From 10:15 a.m. to 11:15 a.m. = 1 hour. From 11:15 a.m. to 11:30 a.m. = 15 minutes. Total: 2 hours 15 minutes.

Card 6Time Conversion

Convert 1 hour 20 minutes to minutes only

Answer

80 minutes. Since 1 hour = 60 minutes, we calculate: 60 minutes + 20 minutes = 80 minutes total.

Card 7Time Conversion

Convert 150 minutes to hours and minutes

Answer

2 hours 30 minutes. Divide 150 by 60: 150 ÷ 60 = 2 remainder 30. So 150 minutes = 2 hours 30 minutes.

Card 8Time Estimation

Which activities take seconds to complete: blinking eyes, making a phone call, or switching on lights?

Answer

Blinking eyes and switching on lights take seconds. Making a phone call takes minutes. Very quick actions like blinking (less than 1 second) and flipping a switch (1-2 seconds) are measured in seconds

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Frequently Asked Questions

What are the important topics in Racing Seconds for CBSE Class 5 Mathematics?

Racing Seconds covers several key topics that are frequently asked in CBSE Class 5 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.

Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

There are 20 flashcards for Racing Seconds covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.