# LESSON PLANNING OF SUBTRACTION

LESSON PLANNING OF SUBTRACTION OF 3-DIGIT NUMBERS WITH BORROW

Subject Mathematics

Student’s` Learning Outcomes

• Subtract ones from 3-digit numbers with borrow.

• Subtract 2-digit numbers from 3-digit numbers with borrow.

• Subtract 3-digit numbers from 3-digit numbers with borrow.

Solve real life problems of subtraction with borrow.

Information for Teachers

• “Minuend” is the name for the number which is being subtracted.
• “Difference” is the word for the number left after the subtrahend is subtracted from the minuend.
• If the unit digit of minuend is smaller than that of subtrahend, for subtraction, we have to borrow from tens digit (one ten = ten units)

• While teaching the lesson, the teacher should also consult textbook at all the steps where and when applicable.

Material / Resources

Writing board, chalk / marker, duster, match sticks, pencils, rubber band, ball frame, blocks of unit tens and hundred, fake notes of different values.

Introduction

• Draw the figure on a chart and display in front of the students.

• As students how many stars will be there if they are combined in the third container? How many blue stars are more than white stars?
• Again refers to the chart paper and tell them that each blue star stands for 10 white stars.
• If 1 blue star goes to the white stars, what will be the number of white stars? (18)
• If 1 more than one blue star goes to white stars, how many white stars are there now? (28)
• Continue till all the blue stars are turned into white stars.
• Explain the process of turning tens into units.

Development

Activity 1

• Tell the following numeral story to the students.
• From ‘10’ units, if we subtracts’ 5 units, how many units will left? (5)
• How many pencils / match sticks that Ali will put into cup board? (115)
• Ten packets of ten pencils make hundred pencils.

Activity 2

• Teacher will ask one student to write 3-digit number on the board. (e.g. 453)
• He will ask another student to show this
• Number on ball frame with beads / balls, such as; Hundreds, tens, unit
• Teacher will say we want to subtract 66 from this number.
• What we will do for subtraction of 66 from this number.
• What we will do for subtraction of 66 from 453? (Will take out 6 balls beads from unit rod, 6 balls from tens rod)
• Are there 6 balls / beads in unit and tens rod? (No)
• Then what we will do? (Will borrow from tens)
• Take out one yellow ball / beads in unit rod in place of yellow one.
• Now there are 13 red ball / beads in unit rod and 4 yellow in tens.

• Similarly we can`t takeout 6 yellow from remaining 4, we will take out one green from hundreds rod and put 10 yellow in tens rod in place of green one.
• Now there are 14 yellow balls / balls in tens rod.
• We can take out 6 balls / beads from 13 and 6 yellow balls from 14.
• How many ball / beads (green) in hundreds rod? (3)
• How many ball / beads of three colors left? (Red =7, yellow =8, green =3)

• What are the remaining ball / beads in all strings? (387)

Activity 3

• Tell the story to the children.
• “In annual sports team A has 612 points. Team B has 424 points. How many more points does team (A) have than (B)?
• Deduce with the help of students.
• To find how many more points team (A) have than B. we will subtract.
• Ask one student to write question on the board.

• Ask another student to subtract units from units by taking borrow from tens.

• Ask third student to subtract tens by taking borrow from hundred.

• Fourth child will subtract the hundreds.

Activity 3

• For how many more points team (A) won?
• Ask from the student to read aloud and write on the board. Team (A) won by 188 point from team (B).

Sum up / Conclusion

• If minuend`s unit digit is smaller than unit digit of subtrahend, we borrow from tens i.e., one ten = ten units.

• The value of left side digit is ten times the digit on the right side.

• There are 10 tens in hundred.
• If minuend digit is smaller than the subtrahend, at any place, then we borrow from the next higher place.

Assessment

• Divide the class into four groups.
• Provide the student cards or fake notes of different amount.

Provide them a paper /worksheet with written story (e.g.

• Ask each group to discuss and solve in their group.
• Ask students to present their work after completion.