![]() If you’d like to remember the first digits of pi, just count the number of letters in each word of the following sentence: This trick is cute for anyone who appreciates word play: Your answer should contain the numbers 1, 2, 4, 5, 7, and 8.įor example, if your original number was 6, your answer will be 714,285. Step 5: Finally, divide your answer by 7. Step 4: Now, multiply your number by 1,001 (here’s where you may want to use a calculator, unless you want to go back and use the large sums trick from earlier in the article!) This one may require a calculator but here’s another trick, just for fun: Step 3: Divide your original number by your answer from step 2. Step 1: Think of a three digit number where all the numbers are the same. Here’s a similar trick that works every time: Step 5: Subtract your original number from the number in step 4. Here’s a cool math trick to use on your friends: 11.75 is 5% of 235.Ĥ More Math Tricks to Impress Your Friends Simple, here’s an easy trick.įirst move the decimal in 235 one spot to the left (if it’s not written out in this form, assume that the decimal appears after the sum). Put the two numbers together and you get 27.ĭo you need to quickly figure out a percentage of a large sum? Say you need to figure out 5% of $235.00. Next, subtract that same number from 9, and that will be the second digit of your answer. This number will be the first digit of your answer. Note that this trick only works for the basic multiplication table from 1 – 10.įirst, subtract 1 from the number that you are multiplying by 9. Many people find multiplication by 9 a little confusing. Your final answer will be the two numbers together: 27. Then count the fingers remaining after your folded finger, which will be 7 in this case. ![]() Next, count how many fingers remain before your folded finger. So, if you are trying to figure out 9 x 3, you will fold down your 3rd finger, which is the middle finger on your left hand. Next, count your fingers from left to right, and fold down the number finger that you are multiplying by nine. Place your hands up in front of you with your palms facing away from you. Did you know that you can also use your finger for multiplying by 9? Many people still use their fingers to do simple addition and subtraction. Here, you’ll want to subtract 1 from the number, cut that number in half, and add a 5 for the answer.Īdd a 5 after 22, and there’s your answer: 225. Now, multiplying 5 by odd numbers has a different trick. In order to multiply 5 by an even number, you’ll simply cut the number in half and add a 0.Ĭut 4 in half to make 2, and then add a 0 to it to make 20. Here’s a quick way to multiply 5 by both even and odd numbers. The answer is 1,000 – 546 = 454 Multiplying by 5 Put these numbers together and you have the answer. Then, we subtract the final number from 10: ![]() This is a cool trick for subtracting a big sum from 1,000.įirst we subtract the first two numbers from 9: It may seem complicated at first, but once you do it in your head a few times it will be a treasured trick for doing big sums without a calculator. Together you have 8 (6 + 2), and this is the number that you’ll subtract from 890. ![]() If you need the exact sum, then you’ll simply add or subtract the missing numbers from when you rounded up the first sums.Ħ50 is 6 more than 644, and 240 is 2 more than 238. 5 + 4 is 9, so you have 90.Īltogether you now have 890 as you answer. Automatically this has already simplified your work. For example, if you’re adding 644 + 238, you’ll round up to 650 and 240. The first step is to round up big numbers to the closest ten. Here is a quick trick to help make larger sums simpler. Adding Large SumsĪdding up large numbers in your head can be overwhelming. We’ve also included a few cool math tricks just to impress your friends and learn to have a little fun with numbers. Take a look at these simple math tricks, and try them out yourself. Whether you’re preparing for the SAT s and need to pick up some math skills quickly, or whether you’re brushing up to take an advanced course in college, learning a few helpful math tricks can help you feel more confident without a calculator. Many people find math to be difficult, and big sums can look overwhelming at first glance.
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