Page 16 - SM inner class 6.cdr

E xercise 2.2

Solve by using BODMAS rule.
1. 2 6 3 4 2 5 20 5 3 50´ + - / - + / ´ +
2. (3 3 5+ - ) (15 5 ) 10 99
-
-
´
´
3. 50 5 7 2 11 3 10 2 2 6 5/ - ´ + + ´ / - + ´
4. 4 5 7 8 5 12 8 2 6 3 20 2+ - + ´ - ´ / + - + /
5. 9 9 30 3 5 6 7 2 9 9´ - / + - + - + ´
+
)
6. (10 4 6 7 8 2 3 3´ - + - / + ´ + 4 5 6 3 + 1
-
/
3
5
7. (2 2 2 2 4´ + ´ + ) / 8 + (5 ´ - ´ - ´ ) / 3
3
2
2
-
+
+
8. (5 5 25´ - / ) 12 4 5 + (9 3 2 )
´
-
5
}
¸
-
-
-
+
´
9. 40 -[ 16 -{ 9 -( 15 8 2)}] 10. 34 -[ 26 -{ 13 6 9 1 + 14 7]
11. 58 -[ 28 -{ 16 ¸( 27 3 2 17)}] 12. [(36 10´ ) (5 3 5 )] [23 - ( 2 ){[16 - (56 33 )}]
¸
´
´
-
+
¸
-
-
-
13. 23 4 2+ [ -{ 4 + ( 7 2 6 5 - 2 + 3]
}
)
´
-
-
-
)
14. 16 + [ 7 + {( 3 7 - 5 3}]
+
Num ber Pat terns 12345679 ´ 9 ´ 3 = 333333333
Find ing and un der stand ing pat terns gives us 12345679 ´ 9 ´ 4 = 444444444
great power. With patterns we can learn to 12345679 ´ 9 ´ 5 = 555555555
predict the future, discover new things and
12345679 ´ 9 ´ 6 = 666666666
better understand the world around us. And
12345679 ´ 9 ´ 7 = 777777777
play ing with pat terns is fun.
12345679 ´ 9 ´ 8 = 888888888
(i) 1 8 1 9´ + =
(iii) 12345679 ´ 9 ´ 9 = 999999999
12 8 + 2 = 98
´
´
1 1 =1
123 ´ 8 + 3 = 987
´
11 11 =121
1234 ´ 8 + 4 = 9876
´
111 111 =12321
12345 ´ 8 + 5 = 98765 1111 1111 =1234321
´
+
´
123456 8 6 = 987654 11111 11111 =123454321
´
´
1234567 ´ 8 + 7 = 9876543 1111111 1111111 =1234567654321
´
12345678 ´ 8 + 8 = 98765432 11111111 11111111 =123456787654321
´
´
123456789 8 + 9 = 987654321 111111111 111111111 =12345678987654321
´
(ii) 12345679 ´ 9 1 111111111
=
12345679 ´ 9 ´ 2 = 222222222
E xercise 2.3
1. Complete the pattern
2
=
(i) 1 1= 1 (ii) 1 + 2 3
2
2
1 3 2 2 1 + 2 + 3 8
=
=
+
2
2
2
+
+
1 3 5 3 2 1 + 2 + 3 + ... ……
=
=
2
2
2
2
+
1 3 5 7 4 2 1 + 2 + 3 + 4 + ... = ……
+
=
+
+
+
+
1 3 5 7 + ... = ……
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Mathematics In Focus - 6