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Digit sum can only verify your answer with 90% accuracy.
If you want a higher level of accuracy you can use the DS method in conjunction with the DD method. However even that is not 100%.
The only way to be 100% sure your answer is correct, is to do the calculation again.
Hope this clarifies.
If you insist on using the Stem Method, then the best stem number to use is 20.
However, unless you are practising stem multiplication, you should be using the LR method to do the multiplication of 35 x 5.
With the LR method, it is only 3 simple steps:
1) 3 x 5 = 15
2) 5 x 5 = 25
3) Putting it together we get 175.
Yes, you are right. Both methods are not 100%. They are meant to check your answer with a reasonable level of accuracy but there will always be cases where they don’t catch the error.
The easiest way is to use the Bridge or the Vitruvian Man method. But yes, the longer the problem the harder it is going to be do it.
In this case you will retain the -1 as -1 instead of adding 11 to make it positive. Here is how that will turn out:
Check: 14 + 10 = 24
DD: 3 – 1 = 2
Check: 14 – 10 = 4
DD: 3 – -1 = 4
DD: 3 + 1 = 4
Check: 14 * 10 = 140
DD: 3 * -1 = (0+1) – 4
DD: -3 = -3
Check: 14 / 10 = 1.4
DD: 3 / -1 = 1 – 4
DD: 3 / -1 = -3
DD: 3 = -3 * -1
I will add this scenario to the content during the next update.
Let me know if this answer clarifies your question.
As far as I know, there is no scenario where the DD method will fail where the DS method succeeds.
The DD method is more accurate than DS Method. You can be sure 90% of the time with the DS method. However, with the DD method, you will have more than 95% certain.
We still cover the DS method because it is a lot faster to do than the DD method.October 16, 2019 at 5:16 pm in reply to: Two truths and one lie…. Do you know which one is which? #8131
Welcome to the forum. I am guessing the lie is you met Princess Diana. 😉
What habit do you want to focus on first?
Welcome to the community. Looking forward to seeing you start your habit challenge in the community.
Happy to provide you with accountability. Please fill the habit challenge workbooks and post it in your habit challenge section of the community.
Looking forward to your updates in the habit challenge Arindam
Please complete all the workbooks in the habit challenge and post it here so that we can follow along your journey and give you accountability.
Looking forward to your habit challenge. What habits do you plan to work on first?
You should decide which habit you specifically want to form if you have any chance of making it happen.
If you want to break bad habits, then check out this post https://ofpad.com/how-to-break-bad-habits-addictions/
You will be able to make it happen.
I hope you enjoy the book. If you have feedback for me please don’t hesitate to send it across. Always looking for ways to improve.
Hey Scott. That’s great to hear.
The person action object is a bit of an overkill for mental math and might needlessly complicate mental math for you.
I would love to hear the method that works for you. So if something else is working for you, please do share it here.