wpadmin/ October 31, 2018/ Blog/ 0 comments

What are the two consecutive numbers make 639?

Please attempt the above question timed by clicking on the digital timer below:

Hours:Minutes:Seconds
00:00:00

Now, please click on “Reveal Technique” below to reveal the “winning edge technique” leading to the correct answer:


Technique © :

Step 1.  Subtract 1 from 639

639 – 1 = 638

Step 2.   Divide the resulting number from step 1 by two

638 / 2 = 319 [This is one of the consecutive numbers.]

Step 3.   Add 1 to the resulting number from step 2

319 +1 = 320 [This is the other consecutive number]

Answer: 319 and 320

Time allowed: 30 seconds

Time taken using the technique: 3 seconds

Time saved = 27 seconds [9/10th (90%) of time allowed by examiner]

Worksheet – Practice question

What are the two consecutive numbers make 1527?

Step 1.

Step 2.

Step 3.

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