Enem: math tricks taught on TikTok can mislead students; see which ones work and which ones are ‘pitfalls’

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At the request of g1, mathematics teachers analyzed techniques taught on social media and explained what, in fact, can help candidates save time on the test. See if math tricks really help with Enem “Your teacher didn’t teach this at school; learn!”, “See this math magic!”, “Don’t know how to solve fractions? Try this here!”. With the 2023 National High School Exam (Enem) just a few weeks away, hearing these promises on social media even gives you hope of improving your performance in the exact exam, right? The problem is that some videos — with thousands of views — are mathematically wrong or only work in very specific cases. “It’s a huge disservice, which will hinder candidates who are already tense”, says Fellipe Rossi, professor at Colégio ao Cubo (RJ). He recommends that the student: ✏️test whether the trick works with other numbers, in addition to those that appear in the recording; 👨‍🏫 confirm with a teacher whether it really can be a good resolution tactic. Below, see the analysis of five “tricks” taught on TikTok and find out which ones can really help the student (and which ones are complete traps). At the end of the report, check out a bonus with two (correct!) ways to speed up accounts involving the number 5. ✅ Click here to follow the g1 Enem channel on WhatsApp 1 – Multiplication of two digits is faster — is it? See if the trick for multiplying 2 digits really helps with Enem A video with more than 17 thousand likes on TikTok seeks to teach a faster way to do multiplication (see the video above). ⛔Does it work? Only in specific cases, when the first multiplication of the process (unit of the top number x unit of the bottom number) gives a result of “one place” only. For example: when trying to calculate 16 x 12 using the trick, the candidate would need to start by multiplying 6 by 2. The result would be 12 (two digits). In a case like this, the “trick” would only work if it was adapted. “In general, these tricks only work in extremely specific situations. When we try to transfer them to another account, we already encounter problems”, says Leonardo Cavalcante, mathematics teacher on the UpMat Educacional team. “The student needs to insert a new mechanism [que não é citado no vídeo] and transfer the number to the ten — and you probably won’t do that, due to lack of knowledge. You’ll end up making mistakes.” 2 – Square root in the ‘magic of mathematics’? Totally flawed See if the square root trick really helps with the Enem ❌Attention! The video above, which teaches a “trick” for calculating square roots, is a glitch, explain the teachers interviewed by g1. And look at the danger: until the last update of this report, there were already almost 100 thousand likes. It’s very simple to find out that it doesn’t work. Just test with other examples that aren’t in the video, like √144 Using the technique taught on the social network, we would do: 1 + 4 + 4 = 9. Then, 9 – 2 = 7. But the square root of 144 is 12 (and not 7). Another proof that it doesn’t work: √36 . Let’s go: 3 + 6 = 9. 9 – 2 = 7. And the square root of 36 is 6. “You have to be suspicious of everything that seems very incredible”, says Rossi. Are you really in doubt? Ask your teacher 3 – Subtraction ‘without borrowing’: tip that works See if subtraction hacks really help with Enem ✅The technique taught in the video above is mathematically correct and seeks to help the student not need to “borrow” the subtraction calculations. For example: if you were to solve the account “1854 – 569”, you would start by calculating how much it takes for 9 to reach 4. If you don’t know how to deal with this, you can try to follow the advice of social networks and change the numbers, so that the result remains the same. Points of attention: It only works in subtractions. No trying with additions! In some cases, doing the “maneuver” of changing the numbers, as the video teaches, can end up being even more work than the original calculation. “It’s really cool to help the student think about these ways of making numbers more flexible. It can help with mental counting skills”, says Professor Leonardo. 4 – Butterfly technique: it works, but it’s not that innovative See if this fraction trick really helps with Enem ✅In the traditional procedure of solving a sum of fractions, we always learn to do the “least common multiple”, the famous “MMC” . The butterfly trick, taught in the video above, uses exactly the same principle, but with a different representation. “This crossed design, which looks like a butterfly, makes the mechanism more intuitive. But, depending on the account, it may end up lifting longer than the traditional way”, explains Professor Leonardo. See the example below: the “butterfly” requires more calculations. The decision is up to the student: which way do you feel most comfortable with? Which technique is simplest for you? Butterfly or MMC? Art/g1 5 – Multiplication with repeated numbers: only in very specific cases See if the trick for multiplying with equal numbers really helps with Enem The video (see above) “plays fair” and makes it clear that the trick only works in a very specific case : when we multiply numbers with two equal digits (11, 22, 33, etc.) by another number with just one digit. ⛔You need to be careful: don’t try to reproduce this strategy in other situations, ok? Bonus: two tricks for the number 5 Professor Fellipe Rossi teaches, in the video below, two tricks that can help the candidate save time on the Enem when they have to: square a number ending in 5; divide any number by 5. Teacher teaches two ways to save time in exact exams in the Enem Quiz: what should the perfect conclusion in the essay be like?

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