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To introduce subtraction of two-digit numbers in Class III, a teacher proceeded in the following steps Step I: Revision of two-digit numbers with an understanding of the place value system. Step II: Use tally marks to show that smaller numbers can be subtracted from the larger number. Step III: Application of subtraction on numbers under each column of place value. In this case, the teacher is developing the lesson

To introduce subtraction of two-digit numbers in Class III, a teacher proceeded in the following steps Step I: Revision of two-digit numbers with an understanding of the place value system. Step II: Use tally marks to show that smaller numbers can be subtracted from the larger number. Step III: Application of subtraction on numbers under each column of place value. In this case, the teacher is developing the lesson Correct Answer from system concept → algorithm → operation

Number system - A number system is a writing system for expressing numbers; i.e., a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. The number the numeral represents is called its value.

The value of any digit in a number can be determined by:

  • The digit
  • Its position in the number
  • The base of the number system

Important Points

  • Here, the teacher is forming concepts with an understanding of the place value system.
  • Algorithm - An algorithm is a procedure or formula for solving a problem, based on conducting a sequence of specified actions. An algorithm usually means a small procedure that solves a recurrent problem. The algorithm is used by the teacher as she uses tally marks to show that smaller numbers can be subtracted from the larger number.
  • Operation - A mathematical process. The most common are add, subtract, multiply and divide (+, −, ×, ÷). But there are many more, such as squaring, square root, logarithms, etc Here the teacher is operating subtraction on numbers under each column of place value.

Here, according to the steps followed by the teacher option 4 is the correct choice.

Related Questions

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Karim threw dice 30 times and noted the number appearing each time as shown below: 1, 2, 1, 2, 4, 4, 4, 3, 3, 2, 1, 1, 6, 3, 4, 6, 1, 3, 2, 6, 3, 5, 6, 3, 4, 4, 5, 6, 3, 1 The tally table of the above data will be (A)  Digits of dice occurred Tally marks 1 |||| | 2 |||| 3 |||| || 4 ||||  5 ||| 6 |||| (B) Digits of dice occurred Tally marks 1 ||||  2 |||| 3 |||| || 4 |||| | 5 ||| 6 |||| (C) Digits of dice occurred Tally marks 1 ||||  2 |||| 3 |||| | 4 |||| | 5 |||| 6 |||| (D) Digits of dice occurred Tally marks 1 |||| | 2 |||| 3 |||| || 4 |||| | 5 || 6 ||||
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