Page 12 - SM inner class 7.cdr

Review Exercise
1. Draw the num ber line to rep re sent the fol low ing num bers.
(a) -4 to + 3 (b) -1 to + 6 (c) -5 to + 5

2. Write the nu mer i cal val ues of given in te gers.
(a) -6 (b) -28 (c) + 43
3. Ar range the given in te gers in de scend ing or der.
,
1
,
(a) -10, - +1, -6 0 (b) + 3, -3, + 4, -4, + 2, -2
4. Prove that
+
´
)
+
3
=
(
2
(a) (+11 ) (-6 ) (-6 ) (+11 ) (b)[(+1 ) (-2 )] (-3 ) (+1 ) ´ - ´ - )
=
(
´
=
+
´
+
=
´
1
(
(c) (-7 ) (-8 ) (-8 ) (-7 ) (d) [(-24 ) (-13 )] (+ 27 ) (-24 ) + - ) + + )
[
2
7
3
(
5. Fill in the boxes.
W
=
-
=
(a) (+ 43 ) (-18 ) ( ) (b) ( ) (W - +11 ) (-31 )
W
W
-
-
=
(c) (-52 ) ( ) (-24 ) (d) (+123 ) (+ 87 ) ( )
=
6. Sim plify the fol low ing.
¸
¸
¸
(a) (-182 ) (+14 ) (a) (+ 345 ) (+ 23 ) (c) (+1221 ) (-111 ) (d) (-4140 ) (345 )
¸
7. A six-storey build ing has 36 m height. A mon key can climb 3m in one jump. In how many jumps would the
mon key reach at the top of the build ing?
8. A gar dener plans to plant 630 trees in 21 rows each con tain ing the same num ber of trees. How many
trees will be there in each row?
9. A per son gained ` 1000 in one trans ac tion and lost ` 1200 in an other trans ac tion. Did the per son gain or
lose dur ing the whole trans ac tion and by how much?
10. An A.C. cools the room at the rate of 5°C per hour. what would be the fi nal tem per a ture of the room af ter
6 hours, if initial temperature of the room is 40°C.

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Mathematics In Focus - 7