Page 188 - Start Up Mathematics_4

4. Study the patterns and write the products.

(a) 11 × 11 = 121 (b) 3 × 5 = 15
111 × 111 = 12321 6 × 5 = 15 + 15 = 30

1111 × 1111 = 1234321 12 × 5 = 30 + 30 = 60
11111 × 11111 = ________ 24 × 5 = ____ + ____ = ____
111111 × 111111 = ________ 48 × 5 = ____ + ____ = ____

1111111 × 1111111 = ________ 96 × 5 = ____ + ____ = ____

5. Add 3,724, 4,867 and 9,214. Check your answer by casting out 9.

LET’S EVALUATE

1. Write ‘T’ for true and ‘F’ for false statements.
(a) A square has 3 edges. (b) A quadrilateral is a closed figure.

(c) A cuboid has 6 vertices. (d) Diameter is the longest chord of a circle.
(e) A quadrilateral having both pairs of opposite sides equal is called a square.

2. Tick the closed figures.

(a) (b) (c)

(d) (e)

3. Find the radius of the circle whose diameter is 28 cm.

4. Which shape is represented by the given net?

5. Draw circles of radius (a) 5 cm and (b) 8 cm. Calculate their Top
diameters.

6. Draw the front, side and top view of the given box.
Side

Front

180