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Everyday Mathematics: Conversions | Mathematics Olympiad Class 4 PDF Download
Q1. A rope is 3.5 kilometers long. How many meters is this?
(a) 350 meters
(b) 3,500 meters
(c) 35 meters
(d) 3,000 meters
Ans: (b) 3,500 meters
1 kilometer = 1,000 meters. So, 3.5 km × 1,000 = 3,500 meters.
Q2. A bag of rice weighs 2.8 kilograms. How many grams is this?
(a) 280 grams
(b) 2,800 grams
(c) 28 grams
(d) 2,000 grams
Ans: (b) 2,800 grams
1 kilogram = 1,000 grams. So, 2.8 kg × 1,000 = 2,800 grams.
Q3. A movie lasts 1 hour and 45 minutes. How many minutes is this in total?
(a) 105 minutes
(b) 90 minutes
(c) 75 minutes
(d) 120 minutes
Ans: (a) 105 minutes
1 hour = 60 minutes. So, (1 × 60) + 45 = 60 + 45 = 105 minutes.
Q4. If 1 USD = 83 INR, how many rupees will you get for 25 USD?
(a) 2,075 INR
(b) 2,000 INR
(c) 1,875 INR
(d) 2,150 INR
Ans: (a) 2,075 INR
To convert USD to INR, multiply by the exchange rate: 25 × 83 = 2,075 INR.
Q5. A toy costs 450 paise. How many rupees is this?
(a) 4 rupees
(b) 4.5 rupees
(c) 45 rupees
(d) 5 rupees
Ans: (b) 4.5 rupees
1 rupee = 100 paise. So, 450 paise ÷ 100 = 4.5 rupees.
Q6. A dog weighs 12 pounds. How many ounces is this?
(a) 180 ounces
(b) 192 ounces
(c) 160 ounces
(d) 200 ounces
Ans: (b) 192 ounces
1 pound = 16 ounces. So, 12 × 16 = 192 ounces.
Q7. Convert 3/4 to a decimal.
(a) 0.75
(b) 0.34
(c) 0.7
(d) 0.8
Ans: (a) 0.75
To convert a fraction to a decimal, divide the numerator by the denominator: 3 ÷ 4 = 0.75.
Q8. A game lasts 300 seconds. How many minutes is this?
(a) 4 minutes
(b) 5 minutes
(c) 6 minutes
(d) 3 minutes
Ans: (b) 5 minutes
1 minute = 60 seconds. So, 300 seconds ÷ 60 = 5 minutes.
Q9. Convert 5/6 to a percentage.
(a) 83.33%
(b) 50%
(c) 66.67%
(d) 80%
Ans: (a) 83.33%
To convert a fraction to a percentage, multiply by 100: 5/6 × 100 = 500/6 ≈ 83.33%.
Q10. Convert 13/4 to a mixed number.
(a) 3 whole 1/4
(b) 2 whole 3/4
(c) 4 whole 1/4
(d) 3 whole 3/4
Ans: (a) 3 whole 1/4
Divide the numerator by the denominator: 13 ÷ 4 = 3 (whole number) with a remainder of 1, so it’s 3 1/4.
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FAQs on Everyday Mathematics: Conversions - Mathematics Olympiad Class 4
| 1. What are conversions in mathematics? |  |
Ans.Conversions in mathematics refer to the process of changing a quantity from one unit to another. This can include converting measurements, such as changing meters to kilometers, or converting currencies, such as changing dollars to euros. Understanding conversions is essential for solving real-world problems in various contexts.
| 2. Why are conversions important in everyday life? | |
Ans.Conversions are important in everyday life because they help us understand and compare different measurements and quantities. For example, when cooking, you might need to convert cups to ounces. In travel, converting currency helps you know how much you are spending. Mastering conversions ensures accuracy and efficiency in daily activities.
| 3. How can I practice conversions for my Class 4 exam? | |
Ans.To practice conversions for your Class 4 exam, you can use worksheets that include problems on converting lengths, weights, and volumes. Online quizzes and educational games can also reinforce your skills. Additionally, working on real-life examples, like measuring ingredients for a recipe, can help you understand conversions better.
| 4. What are some common units to convert in Class 4 math? | |
Ans.Some common units to convert in Class 4 math include length (meters, centimeters), weight (grams, kilograms), volume (liters, milliliters), and time (hours, minutes). Familiarizing yourself with these units and their relationships is crucial for mastering conversions.
| 5. How do I know which conversion factor to use? | |
Ans.To know which conversion factor to use, you need to be familiar with the relationship between the two units you are converting. Each unit has a specific conversion factor. For example, to convert inches to centimeters, you would use the factor of 2.54 (1 inch = 2.54 centimeters). Remembering these factors or having a reference guide can help you choose the correct one.
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