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11 Nov 2020, 14:10
Kudos
Bookmarks
I was trying to get faster and found this link. I loved how fas it can be for us to multiply by 13!
1. The technique, as a matter of fact, is so ridiculously simple that you can’t help but wonder why no one taught you this trick when you were a child. Then again, I’m speaking for myself here, because nobody actually taught me how to memorize the 13 times table this way, either.
The trick involves writing down the times table for the number 3 as follows:
Multiplier Result (3 times table)
1 3
2 6
3 9
4 12
5 15
6 18
7 21
8 24
9 27
10 30
2. Are you with me so far? So what we have written down is basically
1 x 3 = 3
2 x 3 = 6
3 x 3 = 9
4 x 3 = 12
etc.
With that table done, you can easily derive the 13 times table. What you need to do is to combine both numbers you have written and you will get the 13 times table:
1 3 -> 13
2 6 -> 26
3 9 -> 39
So the multiplier becomes then tens and the 3 times table result becomes the unit.
For the next numbers, you simply need to add the 10s of the 3 times table result to the multiplier number:
So 4 12 becomes (4+1) 2 -> 5 2 -> 52. To check, 4 x 13 is indeed 52.
5 15 becomes (5+1) 5 -> 6 5 -> 65. And true enough, 5 x 13 is 65.
The 13 Times Table made easy
Here is the complete table, including the “trick” to help memorize your 13 times table – and yes, it works all the way up to 13 x 13 and beyond:
Multiplier Result (3 times table) “Trick” 13 Times Result
Source: https://mathrider.com/quick-way-to-remember-13-times-table
1. The technique, as a matter of fact, is so ridiculously simple that you can’t help but wonder why no one taught you this trick when you were a child. Then again, I’m speaking for myself here, because nobody actually taught me how to memorize the 13 times table this way, either.
The trick involves writing down the times table for the number 3 as follows:
Multiplier Result (3 times table)
1 3
2 6
3 9
4 12
5 15
6 18
7 21
8 24
9 27
10 30
2. Are you with me so far? So what we have written down is basically
1 x 3 = 3
2 x 3 = 6
3 x 3 = 9
4 x 3 = 12
etc.
With that table done, you can easily derive the 13 times table. What you need to do is to combine both numbers you have written and you will get the 13 times table:
1 3 -> 13
2 6 -> 26
3 9 -> 39
So the multiplier becomes then tens and the 3 times table result becomes the unit.
For the next numbers, you simply need to add the 10s of the 3 times table result to the multiplier number:
So 4 12 becomes (4+1) 2 -> 5 2 -> 52. To check, 4 x 13 is indeed 52.
5 15 becomes (5+1) 5 -> 6 5 -> 65. And true enough, 5 x 13 is 65.
The 13 Times Table made easy
Here is the complete table, including the “trick” to help memorize your 13 times table – and yes, it works all the way up to 13 x 13 and beyond:
Multiplier Result (3 times table) “Trick” 13 Times Result
Source: https://mathrider.com/quick-way-to-remember-13-times-table
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
12 Nov 2020, 14:08
Kudos
Bookmarks
By the way, people, the in-house gmatclub guide has some interesting info regarding the numbers 1-12 (not that you may need to memorize them all!)
12 Nov 2020, 14:10
Kudos
Bookmarks
OnlineTutorKnight
I do think that memorizing helps a lot: less mistakes and more time for you!
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
