Answer by following the steps in the math challenge Quiz

Can you name the answer by following the steps in the math challenge?

created by RobPro

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Click any empty Steps or to answer for that location
Start at the top of the column and work your way down to get the answer. To start each column - Just type in the first number. Column 1 = Beginner. Column 2 = Intermediate. Column 3 = Advanced
Also try: Quick Math Challenge V

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Steps
11
x 4
- 26
2/3 of this
x by itself
1/4 of this
÷ 9
x 17
Halve it

Steps
48
3/8 of this
x 2.5
Triple it
- 51
Halve it
3/7 of this
x 4
÷ 12

Steps
18
x 16
- 163
48% of this
x 3.8
- 66
Halve it
√
x 17

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There are 24 comments for this game.
(Warning: comments may contain spoilers)

Quick Math Challenge VI Quiz

by RobPro

Created Mar 4, 2012 in Science
Featured Apr 5, 2012
Game Plays 19,826

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Archived comments: show them

	Jimh:	Apr 5th, 2012 at 04:32 GMT		7 points
	Whew! That third column was a killer. This test is now the first in my own personal "With One Second Left" club. I plan to have my heart start again in a few minutes.

	MaxMallanite:	Apr 5th, 2012 at 05:11 GMT		-2 points
	50% can do 18*16 in their head with how much time remaining? I doubt it... I'm still working on it...

	JeopardyTempest:	Apr 5th, 2012 at 05:18 GMT		8 points
	20 * 16 = 320, then take away 2*16 = 32. Not a piece of cake certainly, but a lot more reasonable to me than trying to do the direct long multiplication in the head. Definitely a doozy of a third column!

	kcostell:	Apr 5th, 2012 at 05:34 GMT		12 points
	My approach: I already knew that 17^2 is 289 (had to memorize that long ago for Algebra class). Since x^2-1=(x+1)(x-1), 16*18=289-1.

	vikZ:	Apr 5th, 2012 at 05:38 GMT		9 points
	Funny how many approaches there are to that question. My approach was 15 * 18, which is 10 * 18 (180) plus half that (270), and then add 18 to get 288.

	Pedrocelli:	Apr 5th, 2012 at 06:24 GMT		4 points
	I just doubled 18 4 times over - 18, 36, 72, 144, 288. But kcostell I like your approach to it also - I wish I had spotted that.

	vegan_alan:	Apr 5th, 2012 at 09:33 GMT		1 point
	The 48% slowed me down. I needed extra time so I hit the "Play Again" button to come up with 48% of 125. Great challenge, please do more.

	matthewmagiligan:	Apr 5th, 2012 at 10:49 GMT		4 points
	What was up with 18? It was on there, like, every 2 seconds. 44 - 26 = 18. 3/8 of 48 = 18. 3/7 of 42 = 18. And the third column started with 18.

	sirhc1801:	Apr 5th, 2012 at 11:12 GMT		4 points
	(18x10)+ (18x6). That's how I did it anyway. Got killed at 48% though; I mean, what.

	Dantelle:	Apr 5th, 2012 at 11:22 GMT		2 points
	As for the 1816: I did 1016 + 8*16. The 48% of 125 stole much more time.

	RobPro:	Apr 5th, 2012 at 11:37 GMT		3 points
	Tip for 48% one - 1% of 125 is 1.25, x 2 = 2.5. 50% of 125 is 62.5, therefore 48% = 62.5 - 2.5 = 60. Tip for 18 x 16, I do, 10 x 18 = 180 + Half of that (5) = 270 and then + 18 = 288

	sickmission:	Apr 5th, 2012 at 11:44 GMT		17 points
	For 48% of 125, I thought, "1/2 of 125 is 62.5. 48% would be, I dunno, a little less. So, um, 60? Right? Sweet!" This may or may not have been the most scientific way to go about it.

	Tommy_C:	Apr 5th, 2012 at 12:39 GMT		2 points
	sickmission, now you're thinking like an engineer. 48% is a little less than half.

	MaxMallanite:	Apr 5th, 2012 at 12:56 GMT		0 points
	heh i did that one starting at 55 and going up one until i got to sixty

	bigjoeco:	Apr 5th, 2012 at 13:19 GMT		3 points
	Ok, I know it's not popular to post your own time and I hate it when other people do it, but I just got to the end with one second left on the clock. Seriously, I'm pumped. I'm fired up. Time to put this adrenaline rush to good use at work today... or just do more quizzes.

	AuroraIllumina:	Apr 5th, 2012 at 13:37 GMT		3 points
	1816 - I did that one by going (18 4) * 4. 48% of 125 - I did that one by converting the percentage to a fraction, and doing 12/25 * 125 = 12(125/25) = 12 5.

	jodyjm13:	Apr 5th, 2012 at 13:57 GMT		4 points
	1816: The previous column had 184=72, so I just did 72*4. \|\| 48% of 125: Let's see, 1% is 1.25, so 4% is 5, times 12... cool, it worked. Though I prefer sickmission's method.

	pinklily109:	Apr 5th, 2012 at 14:41 GMT		4 points
	For the 48% of 125, I thought of it as multiplying 125 by (48/100), which, by cross cancellation, reduces to 5 x (48/4) (because you can divide 125 by 25 to get 5 and 100 by 25 to get 4). Then 48/4 is simple, 12, and 12 times 5 is also simple, 60.

	jackmcc:	Apr 5th, 2012 at 14:59 GMT		3 points
	I know 16^2 off the top of my head, and 16*2 is simple, so I just added those together. Agreed that 48% was much harder. I did that the same as @Aurora

	Capn:	Apr 5th, 2012 at 16:35 GMT		5 points
	for 18*16 I just add the four parts: 100 + 80 + 60 + 48. "Long" multiplication in your head isn't so bad with two-digit numbers.

	Djibouti:	Apr 5th, 2012 at 20:02 GMT		2 points
	I immediately thought of a quick way to do 48%, but unfortunately when I divided 125 in half in my head I somehow got 72.5

	Pedrocelli:	Apr 27th, 2012 at 08:08 GMT		1 point
	Try this: 125 is an eighth of 1000, 48 is 6 x 8, so 48% of 125 is the same as 6% of 1000 (divide and multiply by 8) or 60% of 100 (multiply and divide by 10), ie: 60. I find that if you see numbers as products of other numbers, rather than sums of other numbers, problems like this get easier.

	Pedrocelli:	Apr 27th, 2012 at 08:10 GMT		4 points
	Or try this: 125 is a quarter again of 100, and 48% of 100 is 48 (by definition), so a quarter again of 48 is 48 plus 12 = 60. If the numbers were different this approach might not work but we were given good numbers.