twitter facebook rss

Mental Maths (Subtractions)

Mental Maths (Subtractions)

In this post, we will show you how to do Subtractions Mentally. Have a look at the following examples....





  • 987 - 256 = ?

    • Instead of taking a single digit at a time, subtractions would be faster by taking two digits.... See here
      • 87 - 56 = 31
      • 900 - 200 = 700
        • So, the result of 987 - 256 = 731









  • 824 - 587 = ?

    • Take 100s Complement of 87 (i.e. 100 - 87) which is 13 and add it to 24. The result is 37. This gives the units and tens digits of the result. Since 24 < 87, we have actually subtracted 87 from 124 i.e. we have borrowed 1 from 8 ( of 824). So, we now do (7-5) = 2. The result is 237. (For new learners, this technique may look lil confusing. If you feel it is confusing, then just read it for two times and try to understand the logic behind it).





  • 9217 - 858 = ?

    • Adding 100s complement of 58 (which is 42, i mean 58 + 42 = 100) to 17, we get (42+17) = 59 which gives the units and 10s digits of the result. 
    • Since 58 is greater than 17, we have to borrow 1 from 92 which leaves us with 91.  So, the first part of the answer is 91 - 8 = 83. SO, the result is 8359.





  • 934 - 286 + 847 - 798 = ?

    • When we have a combination of additions and subtractions, first add all the numbers with + sign before them and add all the numbers with - sign before them. 
    • I mean (934 + 847)  - (286 + 798) = 1781 - 1084
    • By applying the method explained in previous examples, 1781 - 1084 = 697.

        

0 comments

Readers Comments

You can find 10 th result Accounting, Anna university news, Bank exam study materials, Bank jobs, Biotechnology, Campus interview Tips, Daily GK Updates, Diploma Result, English study materials, Experince job, Fresher jobs, Government jobs, jobs in Dubai, jobs in gujarat, Jobs in Hyderabad, jobs in kolkata, jobs in mumbai, jobs in noida, jobs in Pune, latest news, Mobile tricks, Off-campus, SSC recruitment, TNPSC Group 2 Question Papers, Walk in in this blog.

RSSFeatured Post 6

Contact Form

Name

Email *

Message *

Latest Posts

ANNA UNIVERSITY CP4073 BLOCKCHAIN TECHNOLOGIES M.E SYLLABUS REGULATION 2021 CSE M.E SYLLABUS

 ANNA UNIVERSITY CP4073 BLOCKCHAIN TECHNOLOGIES SYLLABUS REGULATION 2021 | ANNA UNIVERSITY M.E REGULATION 2021 SYLLABUS  UNI...

Read in full »
Contus Hiring experienced UX/UI Designer Chennai

Contus Hiring experienced UX/UI Designer Chennai Company: Contus Website:&...

Contus Hiring React JS/Full Stack Developers at Chennai

Contus Hiring React JS/Full Stack Developers at ChennaiCompany: Contus ...

Tamilnadu Board Results 2018 | TN Board +1/11th Class Result 2018 | TN Board HSC Plus One Result 2018

Tamil Nadu Board HSC (+1) First Year Examination Results 2018 announced by the...

Bank jobs

LIC ADO Recruitment 2015:Apply for 5066 Posts

LIC ADO Recruitment 2015    :Apply for 5066 PostsLife Insurance Corporation Limited (LIC) issued the notification for the rec...

Read in full »

OFF Campus

NTT Data Off Campus Drive For Freshers as Graduate Software Trainee

Off Campus Drive For Freshers as Graduate Software Trainee Company Name: NTT Data About NTT Data:NTT DATA is your Innovation Partner...

Read in full »

Walk ins

SYNTEL Walk In Drive For Freshers as Financial Analyst

SYNTEL Walk In Drive For Freshers as Financial Analyst Company Name: Syntel Company Profile: Syntel (NASDAQ: SYNT) is a leadin...

Read in full »

Experienced jobs

Contus Hiring experienced UX/UI Designer Chennai

Contus Hiring experienced UX/UI Designer Chennai Company: Contus Website: www.contus.com Eligibility: Any Graduate Experience: ...

Read in full »

Fresher jobs

Bank jobs

Walk ins

Government jobs

Study materials

PC tricks