addition maths riddle viral on Twitter

This maths riddle should be easy, but it took me so long to solve I’m embarrassed

Go on, admit how long it took you to work out

These days, I actively enjoy putting myself through hell. And by hell, I mean viral sums on Twitter that everyone else says they can crack easily, but leave me sweating and questioning my life. Sigh. So today, another maths addition riddle is going round, and instead of going it alone, I’ve decided to share my struggle with you, and hopefully you’ll solve it quicker than I do.

On the surface, this looks like a relatively easy conundrum. A tweet asks “what’s the answer?” and states 4+7=1281, 4+6=1240, 8+3=1241 and then asks what 9+9 could possibly equal, following this pattern. Spoiler: It’s not 18.

Go on then, what’s the answer to this maths addition riddle then?

Literally everyone in the comments of the tweet, which has been viewed over 30k times, has the same answer: 1818. So how did they get there? If you haven’t solved it you’re going to kick yourself, because when you know how, it’s really simple.

To get the answer all you need to do is add the numbers together, and that gives you the first and last digit of the answer. The numbers in between the first and last digit are then what the numbers multiplied together are.

So for example you take the first numbers, four and seven, which added together is 11. So one is your first digit, and one is your final digit. You then multiply four and seven which is 28, so that’s your number in the middle. Final answer, 1281.

That means for the last question you add nine and nine which is 18 and then times nine by nine which is 81. Meaning your final answer is 1818. Now, back to the rest of your day!

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