4th Grade Math Trivia

• A "half dozen" refers to half of a dozen, and a dozen means 12 of something. Therefore, when you buy half a dozen eggs, you are purchasing half of 12, which equals 6. So, the correct answer is 6 eggs. This term is commonly used in various contexts to refer to groups of 12, and understanding it allows you to quickly calculate quantities in this way. When you hear "half a dozen," it simply means you have 6 of whatever item is being referred to, such as eggs, muffins, or donuts.

• The problem states that there are 20 children, and each child has 5 textbooks. To find the total number of textbooks, you multiply the number of children (20) by the number of textbooks each child has (5). This gives you 20 × 5 = 100 textbooks. Thus, the total number of textbooks is 100. It's a simple multiplication problem where you are calculating the total quantity based on a repeated amount. By applying multiplication, you can quickly figure out the total.

If there are 23 chairs filled in the class, it means that 23 students are present. Since the teacher has a total of 28 students in her class, the number of absent students can be calculated by subtracting the number of present students from the total number of students. Therefore, 28 - 23 = 5 students are absent.

The word "minus" in math refers to the operation of subtraction. It is used to indicate the removal or deduction of one quantity from another. Subtraction involves finding the difference between two numbers or quantities. For example, if you have 5 apples and you eat 3, you can say that you have 5 minus 3 apples, which equals 2. Therefore, "minus" signifies the operation of subtraction.

• If 1GB of memory can hold 350 songs, then to find out how many songs 2GB of memory can hold, you simply multiply the number of songs that fit in 1GB by 2. This gives you 350 × 2 = 700 songs. Thus, 2GB of memory can hold 700 songs. This type of question involves multiplying quantities to scale up based on the given data. It's a great example of applying basic math to real-life situations involving digital storage.

• There are 60 minutes in 1 hour. To find out how many minutes are in 10 hours, you multiply the number of hours (10) by the number of minutes in an hour (60). This gives you 10 × 60 = 600 minutes. Therefore, the total number of minutes you would be waiting is 600. This is a common unit conversion problem where you convert hours into minutes by using the fact that one hour is equal to 60 minutes. It's important to remember this conversion when dealing with time.

• In mathematics, the word "sum" refers to the result of an addition operation, meaning when two or more numbers are added together. For example, if you add 2 and 3, the sum is 5. Understanding the meaning of the word "sum" helps clarify the process of adding numbers and solving problems involving addition.

o find out how many quarters are in 6 dollars, you need to know that there are 4 quarters in 1 dollar.

So, for 6 dollars: 6 dollars * 4 quarters/dollar = 24 quarters.

Therefore, there are 24 quarters in 6 dollars.

The correct answer is: 24 Quarters.

• The box contains three dozen cookies, which equals 36 cookies. To divide these 36 cookies evenly among 9 children, divide 36 by 9. This gives you 36 ÷ 9 = 4 cookies per child. Therefore, each child should get 4 cookies. This is a simple division problem, and it's a practical example of how to evenly distribute a total amount among multiple people.

• To determine the time it takes to drive 270 miles at a speed of 60 miles per hour, divide the total distance (270 miles) by the speed (60 miles per hour). This gives you 270 ÷ 60 = 4.5 hours. Therefore, it would take 4.5 hours to drive 270 miles at this speed. This is a basic speed-time-distance problem.

• Sarah has a 3-meter long ribbon, and she cuts it into pieces that are each 0.75 meters long. To find out how many pieces she gets, divide the total length of the ribbon (3 meters) by the length of each piece (0.75 meters). This gives you 3 ÷ 0.75 = 4 pieces. Therefore, Sarah gets 4 pieces of ribbon. This question involves division to break down a larger quantity into smaller equal parts, which is useful when dealing with measurements.

• In the case of a "buy four get one free" sale, you only pay for the first four items, and the fifth item is free. Each item costs $2.50, so to calculate the cost of the 4 items you have to pay for, you multiply 4 by $2.50. This results in 4 × $2.50 = $10. Therefore, even though you get 5 items in total, you only pay for the first 4, which costs you $10. This is an example of how sales promotions work, allowing customers to receive more for the same amount of money.

To convert inches to feet, you need to know that there are 12 inches in 1 foot. Therefore, to find out how many feet a walkway that is 40 inches in length is, you can use the following calculation:

40 inches ÷ 12 inches/foot = 3.33 feet (rounded to two decimal places)

So, a walkway that is 40 inches in length is approximately 3.33 feet long.

This is approximately equivalent to 3 feet and 4 inches.