Hello and welcome to a fun math adventure! Today, we’re going to learn a cool trick to find out if a number can be divided by 7 without leaving any leftovers. This is called checking if a number is divisible by 7.
Let’s start with a number, like 644. To see if 644 is divisible by 7, we can use a special rule. Here’s how it works:
Because 56 is divisible by 7, we know that 644 is also divisible by 7. Isn’t that neat?
Now, let’s see if 387 is divisible by 7 using the same steps:
So, 387 is not divisible by 7. With a bit of practice, you’ll get the hang of this rule!
If you want to get better at this, you can practice with different numbers. Try using this rule on numbers you see every day, like in a book or on a sign. The more you practice, the easier it will become!
Thanks for joining this math adventure. Keep practicing, and you’ll be a math whiz in no time!
Grab a list of random numbers from a book or magazine. Use the divisibility rule for 7 to determine which numbers are divisible by 7. Write down your findings and share them with a classmate to compare results.
Form teams and have a relay race where each team member must solve a divisibility problem using the rule for 7. The first team to correctly determine the divisibility of all their numbers wins!
Create a puzzle by writing a series of numbers on a grid. Use the divisibility rule for 7 to find a path through the grid where each number is divisible by 7. Share your puzzle with a friend to solve.
Write a short story or comic strip about a character who uses the divisibility rule for 7 to solve a mystery or overcome a challenge. Share your story with the class and discuss how math can be used in real-life situations.
Create bingo cards with numbers on them. As the teacher calls out numbers, use the divisibility rule for 7 to mark off numbers that are divisible by 7. The first student to get five in a row wins!
Sure! Here’s a sanitized version of the YouTube transcript:
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Hello and welcome to Tutoring Hour! In this video, we’ll test if certain numbers are divisible by 7.
Let’s check our first number, which is 644. We’ll determine if it is divisible by 7. To do this, we need to double the last digit and subtract it from the number formed by the other digits. If the difference is divisible by 7, then the original number is also divisible by 7.
Doubling the last digit, we have 8. Subtracting 8 from 64 gives us 56, which is divisible by 7. Therefore, we can conclude that 644 is divisible by 7. The rule here is slightly more complex compared to others. Nevertheless, with a little practice, you can master it!
Now let’s check if another number is divisible by 7. Doubling the last digit of 387 gives us 12. Now let’s subtract 12 from 38, which leaves us with 375. We’ll repeat the process: doubling the last digit of 375 gives us 10. Subtracting 10 from 37 results in 27. Since 27 is not divisible by 7, we conclude that 387 is also not divisible by 7.
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Divisibility – The ability of one number to be divided by another number without leaving a remainder. – Example sentence: To check the divisibility of 24 by 6, we see if 24 divided by 6 leaves no remainder.
Number – A mathematical object used to count, measure, and label. – Example sentence: The number 7 is an odd number because it cannot be divided evenly by 2.
Last – The final position in a sequence or series. – Example sentence: In the number 345, the last digit is 5.
Digit – A single symbol used to make numerals, ranging from 0 to 9. – Example sentence: The number 123 has three digits: 1, 2, and 3.
Double – To multiply a number by two. – Example sentence: If you double the number 4, you get 8.
Subtract – To take one number away from another. – Example sentence: When you subtract 3 from 10, the result is 7.
Result – The answer obtained after performing a mathematical operation. – Example sentence: The result of adding 5 and 3 is 8.
Practice – Repeated exercise in or performance of an activity to acquire proficiency. – Example sentence: To get better at solving equations, you need to practice regularly.
Whole – A number without fractions; an integer. – Example sentence: The number 6 is a whole number because it has no fractional part.
Math – The study of numbers, quantities, and shapes. – Example sentence: In math class, we learned how to solve algebraic equations.
