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    b.         Number of square corners = 0
                                  Number of less than square corners = 0    3.  a.      b.       c.         d.
                                  Number of more than square corners = 6
                    c.         Number of square corners = 2           Exercise 8B
                                  Number of less than square corners = 3
                                  Number of more than square corners = 0     1.  a.      b.        c.        d.
                   d.           Number of square corners = 0             2.  a.        b.           c.        d.
                                  Number of less than square corners = 0
                                  Number of more than square corners = 5    3.  a.  17, 21, 25, 29  b.  220, 270, 320   c.  13, 21, 34   d.  40, 45, 50
                  11.                                                    e.  141, 151, 161   f.  1075, 1085, 1095  g.  Def, Efg, Fgh  h.  K, M, O
                                                                      Exercise 8C
                                                                        2. Honeycomb, chessboard   3.  Fish

                                                                      Exercise 8D
                                                                        1.  a.  Front, Side, Top    b.  Front, Top, Side    c.  Side, Top, Front
                                                                        2.  a.  Front view   b,  Side view   c.  Top view
                                                                        3.  a.  West   b.  West   c.  East   d.  West
                                                                      Learning Logs
                Exercise 7C
                  1.  a         2.  c      3.  b                        1.  a.       b.          c.         d.
                  4.  a.  Number of straight lines = 12; Number of curved lines = 6
                   b.  Number of straight lines = 12; Number of curved lines = 6    2.       8 lines of symmetry (Answer may vary)
                  5.  Shapes made by straight lines = 25; Shapes made by curved lines = 5
                Learning Logs                                           3.  a.                  b.
                  1.  a.  3, 3    b.  4, 4   c.  equal   d.  opposite
                    e.  no, no                                           c.                     d.
                  2.  a.  cone   b.  cylinder   c.  cuboid   d.  sphere
                    e.  cube                                             e.
                  3.  a.  18 rectangles       b.  8 triangles
                    c.  5 triangles, 1 square, 3 rectangles             4.  a.                  b.          c.
                   d.  18 triangles, 3 squares, 4 rectangles
                  4. No of square corners = 8; Less than square corner = 14  d.                 5.  a.
                     More than square corner = 2
                  5. Curved surface = 3; Plane surfaces = 7;
                    Cone, cylinder, cuboid, cube, prism               Mental Maths
                Mental Maths                                               i
                  1.  a         2.  b      3.  a       4.  a                   Chapter 9: Measurement of Length
                Hots                                                  Warm Up
                  1.  a.  10      b.  3    2.  5                        1.   ruler   2. metre rod   3.   measuring tape   4. odometer
                                 Model Test Paper 1                   Exercise 9A
                  1.  d    2. b    3.  a   4.  c    5.  b   6.  b       1.  a.  cm     b.  cm    c.  cm     d.  cm
                  7.  c    8. c    9.  b   10.  b                        e.  cm      f.  cm      g.  cm     h.  cm
                  11.  a.  T   b. F   c.  F   d.  T   e.  T              i.  m       j.  km
                 12.  a.  4420, 4520   b.  5530, 5430                   2.  a.  14 cm   b.  10 cm   c.  12 cm   d.  11 cm
                 13.  a.  100   b. 0   c.  134   d.  0   e.  3639   f.  0  e.  9 cm
                    g.  150   h. 38   i.  100                           3.  a.  Route I   b.  5 m   c.  8 m   d.  8 m
                 14.  a.  2997  b. 7540, 4057                         Exercise 9B
                 15.  a.  9025  b. 4338   c.  5168   d.  Q = 101, R = 1    1.  a.  400 cm   b.  1400 cm   c.  2600 cm   d.  510 cm
                  17.  a.  20   b. 7   c.  8                             e.  9508 cm   f.  1218 cm   g.  4575 cm
                 18.  a.   3     b.   5                                 2.  a.  5000 m   b.  6000 m   c.  9000 m   d.  4300 m
                      8      16                                          e.  2500 m   f.  6015 m   g.  1425 m
                 19.  a.  Cube  b. Cuboid, 12   c. Cone  d.  Sphere  e.  Cylinder  Learning Logs
                 20.  3117                                              1.  a.  100    b.  1000   c.  1     d.  1
                 21.       Square     More than square  Less than square    2.  a.  800 cm   b.  4600 cm   c.  1205 cm   d.  3885 cm
                   a.        2              1              1            3.  a.  7209 m   b.  3486 m   c.  4876 m   d.  3911 m
                   b.        0              6              0            4.  a.  Home to shopping mall via temple   b.  4 km
                          Chapter 8: Symmetry and Patterns            Mental Maths  2.  b   3.  b    4.  a    5.  a
                                                                        1.  c
                Exercise 8A                                           Hots
                  1.  c, d, e, g and h                                     4 blocks, 40 cm
                  2.  a.       b.           c.         d.
                                                                              Chapter 10: Measurement of Weight
                                                                      Warm Up
                                                                        1. Rajeev     2.  Sujoy   3.  Puneet
                    e.          f.         g.          h.               4. Rachna, Geeta, Varun, Arun/Rajeev, Ajay, Sujoy, Puneet
                                                                        5. Arun and Rajeev

                       222       Mathematics 3

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