Bissoy.com
Doctors Medicines MCQs Q&A

Neha was solving a problem in which subtraction of 673–257 was required. She said, "257 plus 100 will be 357, 457, 557, 657. So, 257 plus 400 is 657". "Now 657 plus 10 is 667, 677, so, 657 plus 20 is 677 and 4 less in 677 is 673. "Therefore, 400 plus 20 minus 4 is 416". Hence 673–257 is 416. Which of the following statements is most appropriate for the strategy of Neha?

Neha was solving a problem in which subtraction of 673–257 was required. She said, "257 plus 100 will be 357, 457, 557, 657. So, 257 plus 400 is 657". "Now 657 plus 10 is 667, 677, so, 657 plus 20 is 677 and 4 less in 677 is 673. "Therefore, 400 plus 20 minus 4 is 416". Hence 673–257 is 416. Which of the following statements is most appropriate for the strategy of Neha? Correct Answer It shows Neha is able to use her conceptual understanding of addition and subtraction in developing her own personal algorithm.

Addition, subtraction, multiplication, and division are the basic 4 operations of mathematics. Since maths is open-ended and allows divergent thinking rather than following the same process or concept, a learner is free to use any method or strategy he loves to solve a problem. Key Points

  • In the above example, Neha has a conceptual understanding of addition and subtraction, so she goes with her strategy to solve the given problem.
  • She follows repeated addition and subtraction by rounding to tens and hundreds until she gets the correct answer. 
  • So in maths, there is nothing wrong to use new innovative methods to solve problems.
  • There is no need to follow a routine by rote memorization even if you don't understand it. Conceptual understanding is the key process in mathematics.

Hence the above example shows that Neha can use her conceptual understanding of addition and subtraction in developing her algorithm.

Related Questions

Solve the following: (−18)[36÷7−(−2)]÷{}(−4)19−(−3)×(−5)={}?
(−12)[11+7×(−3)]÷{}[413−(−3)×(−6)]=
416+416+416+416=?
Which one of the following four addresses is NOT EXACTLY the same as the one given below? Neha Mishra 274/12, Moroccan street Ghaziabad, Uttar Pradesh India i. Neha Mishra 274/12, Moroccan street Ghaziabad, Uttar Pradesh India ii. Neha Mishra 274/12, Moroccan street Ghaziabad, Uttar Pradesh India iii. Neha Mishra 274/12, Moroccan street Ghaziabad, Uttar Pradesh India iv. Neha Mishra 274/12, Moraccon street Ghaziabad, Uttar Pradesh India
The present age of Neha’s eldest brother is three times Neha’s present age. Six years back, Neha’s eldest brother’s age was seven times as old as Neha was at that time. What is the present age of Neha’s eldest brother?
When posed with a problem on subtraction, '400 - 45', a student responded. “If it were 40, then the answer would be 60, but its 45 so its 55, 155, 255, 355, therefore, 400 - 45 is 355.” Which one of the following statements is correct for the strategy used by the student?
Six friends, Tanay, Neha, Kalpana, Raashi, Hemant and Chaitra, are standing in a row. There are two persons between Neha and Chaitra. Kalpana is between Raashi and Neha. Hemant is standing beside Chaitra. Neha is at one of the ends of the row. Who is standing between Chaitra and Tanay?
Two boys – Ajay, Gaurav and four girls - Aarti, Anita, Deepti, Neha are sitting in a same row facing towards north. All of them have dressed in different colours of clothes, viz. red, blue, green, pink, black and white (not necessarily in the same order). No girl is sitting at extreme ends of the row except Neha. The one who has dressed in white, is sitting immediate right to Neha. Neha has not dressed in Pink. No boy is sitting with Deepti who has dressed in green. No girl has dressed neither in white nor in black. Anita is sitting at fifth seat. Ajay is sitting in between of two girls but none of them have dressed in Red. What is the position of Aarti and has dressed in which colour?
Neha, Jitu, Pinki, Riya, Simar, Bani, Cynthia and Denny are the names of the students. They have different number of pencils such as 1, 2, 4, 5, 6, 7, 8 and 9. Denny do not have 8 pencils. Neha has more pencils than Pinki. Simar has the third lowest number of pencils. Neha do not have the maximum number of pencils. Bani has more pencils than only one person. Cynthia has the fifth lowest number of pencils. Neha do not have the second highest number of pencils. Riya has the third highest number of pencils. How many pencils does the student exactly in the middle of Jitu and Pinki has?
What was the ratio of ages of Anchal and Neha 4 years ago if the present age of Neha is 24 years? Statement I: The difference of the ages of Neha and Anchal will be 6 years after 3 years. Statement II: After 12 years, the ratio of ages of Anchal and Neha will be 5 : 6.