Math tricks to help you with your math skills that can come in very handy during tricky situations.
Having trouble memorizing the 11 times tables?? Here is a really easy trick that will help you master about all the 11s tables up to 50! First you take any number multiplied by 11 such as 26. Take both the 2 and the 6 and add them together…and you get 8. Then put the number 8 in-between the 2 and the 6 and you have 286. Try another number such as 45. You know the drill, 4+5=9. 495 is the answer. This can help you out a very lot when you are multiplying big numbers by 11. The only part it becomes tricky is when the numbers that add up are over 9. Then you have to carry over and find out the answer.
Another tip I learned while I was in Algebra 1 was how to find the square root of large numbers. My teacher always says look at what the number ends in. Even though this is not really a trick it can help you out a lot when trying to find a square root quickly. So let's say the number is 625 the number ends in a 5, so the only numbers that the square root can end in are only 5. Now you have to think a little bit for the tens digit. Say to yourself what number squared that ends in a 5 could be 625. 30 = 900 is too big, and 10 = 100 is too small. The number would be 25.
Last, a trick that will help you find how a large number is divisible by 11is to add up every other digit, (so you have two different sets of numbers) and subtract them. If the number you get after subtracting them equals 11 or 0, the number is divisible by 11. For example let's use 759. 7+9=16 while left over you have 5. 16-5=11 so 759 is divisible by 11. Now for bigger numbers like 7172 it is the same thing, you just have to add up more numbers.
This will help when you cannot find a number divisible by anything, and always try 11 because they can be trying to trick you.
Having trouble memorizing the 11 times tables?? Here is a really easy trick that will help you master about all the 11s tables up to 50! First you take any number multiplied by 11 such as 26. Take both the 2 and the 6 and add them together…and you get 8. Then put the number 8 in-between the 2 and the 6 and you have 286. Try another number such as 45. You know the drill, 4+5=9. 495 is the answer. This can help you out a very lot when you are multiplying big numbers by 11. The only part it becomes tricky is when the numbers that add up are over 9. Then you have to carry over and find out the answer.
Another tip I learned while I was in Algebra 1 was how to find the square root of large numbers. My teacher always says look at what the number ends in. Even though this is not really a trick it can help you out a lot when trying to find a square root quickly. So let's say the number is 625 the number ends in a 5, so the only numbers that the square root can end in are only 5. Now you have to think a little bit for the tens digit. Say to yourself what number squared that ends in a 5 could be 625. 30 = 900 is too big, and 10 = 100 is too small. The number would be 25.
Last, a trick that will help you find how a large number is divisible by 11is to add up every other digit, (so you have two different sets of numbers) and subtract them. If the number you get after subtracting them equals 11 or 0, the number is divisible by 11. For example let's use 759. 7+9=16 while left over you have 5. 16-5=11 so 759 is divisible by 11. Now for bigger numbers like 7172 it is the same thing, you just have to add up more numbers.
This will help when you cannot find a number divisible by anything, and always try 11 because they can be trying to trick you.
2 comments:
I hear Texas Instruments knows some pretty good math tricks. You should check 'em out.
Here's an easier way to multiply by 11 without hardly having to remember anything.
(a x 10 ) + a = a x 11
Take 32. Just append a zero to it to make it 320 ( 32 x 10 ) then add 32 to it. 352.
Post a Comment