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E:\Working\Focus_Learning\Math_Genius_5_(05-10-2023)\Open_Files\CHAP_05
\\February 16, 2024 2:22 PM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74
Learning by Doing
Objective: Enhancing the concept of addition of decimal numbers using paper strips.
Materials required: Some rectangular paper strips, colour sketch pens, pencil
Procedure:
Let us add 0.5 and 0.7.
Take four identical rectangular strips of paper and fold each of it into 10 equal parts. To
represent 0.5 in one of the strips, shade 5 parts out of the 10 and to represent 0.7 in
another strip, shade 7 parts out of the 10 using the same colour pattern.
5 7
10 10
Now, cut the shaded portion of both the strips and paste two of them on the blank
strips.
1 2
10
The combined strip now represents 1.2, which is shown in addition form as
5 + 7 = 12 = 1.2
10 10 10
To subtract 0.5 from 0.7.
Take two strips and shade both the strips with different colours as done above in the
addition activity.
5 7
10 10
Now, cut out the smaller shaded portions (5 parts) and paste over the other strip as
shown below. You will be left with 2 shaded portions of green.
2
10
Thus, 7 – 5 = 2 = 0.2
10 10 10
124 Mathematics-5
