Amit Patel0:00
Hello hello everyone, welcome back. I'm Amit Patel, and today we'll look at very basic things that almost everyone knows: addition, subtraction, division, and multiplication. Everyone knows these, but some people, from 6th to 10th grade, are afraid of mathematics. They think they can't do it. So let's explain these basics simply. First, let's look at addition. Let me take an example: 5 plus 3. How much is that? Everyone knows it's 8. But what's the difference? There is no difference. Here I wrote plus sign, so it's plus. But sometimes we don't write the plus sign in front of a number, but it's still positive. If you don't have time, we just take the sign. For subtraction: minus 5 minus 3. What happens? If all numbers have the same sign, they add. Here, minus 5 minus 4 minus 3: all have minus, so they add to minus 12. Then we put the sign of the larger number. For subtraction with different signs: plus 5 minus 3. Subtract the smaller from the larger: 5 minus 3 is 2. The larger number, 5, has a plus sign, so the answer is plus 2. If it's minus 5 plus 3, then 5 minus 3 is 2, and the larger number has minus, so answer is minus 2. Let's take another example: minus 5 plus 3 minus 2. First, combine the numbers with the same sign: minus 5 and minus 2 are both minus, so they add to minus 7. Then plus 3 is separate. Now we have minus 7 plus 3: subtract 3 from 7, get 4, and the larger number is minus, so answer is minus 4. Now let's look at multiplication. Example: 5 times 2 is 10. Everyone knows that. But for signs: minus 5 times minus 3. First multiply the numbers: 5 times 3 is 15. Then for signs: minus times minus gives plus. So answer is plus 15. If it's minus 5 times plus 3, then minus times plus gives minus, so answer is minus 15. Another example: minus 5 times minus 3 times minus 2. First multiply numbers: 5 times 3 is 15, times 2 is 30. Then count the minus signs: three minuses. An odd number of minuses gives minus. So answer is minus 30. Let's do one more: minus 5 times plus 3 times minus 2. Numbers: 5 times 3 is 15, times 2 is 30. Signs: two minuses (even) give plus. So answer is plus 30. Now division. Example: 10 divided by 5 is 2. With signs: minus 10 divided by 5. Divide numbers: 10 divided by 5 is 2. Signs: minus divided by plus gives minus. So answer is minus 2. If it's minus 10 divided by minus 5, then minus divided by minus gives plus, so answer is plus 2. If it's plus 10 divided by minus 5, then plus divided by minus gives minus, so answer is minus 2. Let's summarize: For addition and subtraction, if signs are same, add and keep the sign. If signs are different, subtract and take the sign of the larger number. For multiplication and division, if signs are same, answer is positive. If signs are different, answer is negative. I hope this basic video helps those who are afraid of mathematics. If you understood, please like, share, and subscribe.
