Quiz: Can You Pass This Basic 3-Digit Number Addition Test Without Using a Calculator?
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Can You Pass This Basic 3-Digit Number Addition Test Without Using a Calculator?
By: Zoe Samuel
Image: Geri Lavrov/Moment/Getty Images

About This Quiz

Remember how we all used to say, "But Miss Mathteacher, we can just use a calculator?" and she would put us in our places by saying, "You won't always have one with you when you're out and about, will you?" Then along came the smartphone, with its dozens of apps, the least of which can calculate far more with a few taps than even Stephen Hawking could do in his head. Oh, how we laughed at Miss Mathteacher! What a fool she was, to be overtaken by technology - and so quickly!

The truth, though, is that she's still right. Being able to crunch numbers in your head is still important. It's partly that you should be able to detect when numbers just feel off; for example, when a bill seems too high or when the expenses on your spreadsheet are adding up funny. It helps you to spot anomalies like an extra item where it doesn't belong or a misplaced bracket or equals sign that's causing the whole spreadsheet to go kerblooey. It's also just plain handy for when you genuinely don't have a calculator; after all, sometimes your phone dies. More importantly, being able to run figures in your head is a baseline life skill, like being able to cook. So many other skills rest on it that letting it atrophy is actually dangerous for your ability to think clearly, and not just about math; it's also about your ability to deduce a conclusion rationally from a premise. It makes you harder to trick, and just plain smarter.

That's why, doubtless, you've kept that part of your brain spick and span ... and now's your chance to prove it!

1 of 35
What is 172 + 182?
2 of 35
What is 991+101?
3 of 35
What is 728 + 147?
4 of 35
What is 273 + 964?
5 of 35
What is 833 + 484?
6 of 35
What is 836 + 183?
7 of 35
What is 644 + 644?
8 of 35
What is 666 + 583?
9 of 35
What is 727 + 737?
10 of 35
What is 743 + 199?
11 of 35
What is 243 + 838?
12 of 35
What is 353 + 111?
13 of 35
What is 334 + 924?
14 of 35
What is 373 + 211?
15 of 35
What is 737 + 222?
16 of 35
What is 501 + 499?
17 of 35
What is 721 + 279?
18 of 35
What is 833 + 226?
19 of 35
What is 333 + 232?
20 of 35
What is 100 + 1.00?
21 of 35
What is 484 + 0.01?
22 of 35
What is 19.3 + 833?
23 of 35
What is 2.02 + 2.12?
24 of 35
What is 2.33 + 10.1?
25 of 35
What is 9.24 + 82.3?
26 of 35
What is 294 + 6.00?
27 of 35
What is 4.53 + 9.99?
28 of 35
What is 5.43 + 300?
29 of 35
What is 3.12 + 1.09?
30 of 35
What is 10.4 + 3.22?
31 of 35
What is -100 + -101?
32 of 35
What is -342 + 733?
33 of 35
What is -284 + 101?
34 of 35
What is -377 + -223?
35 of 35
What is -712 + -274?
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