Page 195 - Math Skill - 5

Pattern, Net and Symmetry 193

B. Fill in the Blanks
Write the next two numbers in the following sequence.
1. 3, 6, 10, 15, _______, _______ 2. 8, 18, 28, 38, _______, _______

3. 3, 5, 9, 15, _______, _______ 4. 3, 5, 15, 25 _______, _______

Word Stock
Symmetry Reflection Rotation Pattern Observe Shape

Activity

Objective : To understand the rules of a magic square of 3 × 3.
Materials Required : A cardboard/chart paper, coloured paper, fevicol, sketch pens and a pair of
scissors
Procedure : 1. Take a chart paper or cardboard of size 12 cm × 12 cm.
2. Paste a coloured paper on the cardboard.

3. Make a 3 × 3 square on it with sketch pen as shown in (Figure 1).
4. Choose any multiple of 3 as a constant. Let it be 21.

5. Put the number 21 ÷ 3, i.e., 7 called the central number in the middle cell C
5
(Figure 2).
6. Add 1 to the central number and subtract 1 from the central number. Put
these numbers in C and C respectively.
3 7
7. Add 2 to central number and subtract 2 from it. Put these numbers to the
right (C ) and left (C ) of the central number.
6
4
8. Add 3 to the central number and subtract 3 from the central number. Put
these numbers in C and C .
1 9
9. Add 4 to the central number and subtract 4 from the central number. Put
these numbers in C and C respectively.
2
8
10. Your magic square is ready. Verify it (Figure 3).

Observation : A 3 × 3 square Central number = C
1

C 1 C 2 C 3 10 3 8

C C C
4 5 6 5 7 9

C C C
7 8 9 6 11 4
Figure 1 Figure 2
Figure 3