Answers for practice worksheet
Grade-7
Q1
a) 4 9 14 19
b) 3 15 75 375
Q2
a) 16, 19 nth term 3n+1
b) 88, 108 nth term 20n-12
Q3
a) 1.4
b) 16.19
c) 2.73
Q4
a) 43 b) 63 c) 0.63
Q5
a) 4 b) 22
Q6
a) -12
b) -11
50th term 151
50th 988
c) 3
d) 38.7
e) 18
f) -45
g) -5
Q7
a) 30mm2
b) 32cm2
c) 21cm2
Q8
a) £32
b) 24m
c) 27kg
Q9
a) £68
Q10
a) 30% 3/10
b) 65% 13/20
c) 4% 1/25
Q11
a) 0.3
b) 0.36
Q12
a) £45
b) 80cm
Q13
a) (i) 18 (ii) 60
b) (i) 9 (ii) 64
c) (i) 2 (ii) 25
Q14
a) 6n
b) 21i
c) 4d+ 14e
Q15
a) 4h+8
b) 4f-12
Q16
a) c= 7
b) f=8
c) s=12
d) d=3
e) p=8
Q17
a) (i) 5
b) (i) 10
c) (i) 4
d) (i) 1
e) (i) 40
(ii) 4.7 (iii) 4.73
(ii) 9.6 (iii) 9.56
(ii) 4.0 (iii) 4.04
(ii) 0.7 (iii) 0.70
(ii) 40.0 (iii) 39.98
Q18
a) 12+ (8/2)
12+4 = 16
b) 18- (8-3)
18-5 = 13
c) (7-2) x (10-2)
5x8 = 40
d) 8- 22
8-4 = 4
Q19
a) ±4
b) ±9
c) ±10
d) ±12
Q20
a) 55
b) 212
c) 128
d) 52
e) 38
f) 136
g) 60
Q.21
rotational
symmetry
order 3
i) L.S. 2
ii) L.S. 4
iii) L.S. 1
iv) L.S. 3
R.S. 2
R.S. 4
R.S. None
R.S. 3
Q. 22 360/60 = 6° per gram
INGREDIENT
NUTS
OATS
SUGAR
DRIED FRUIT
FRUIT JUICE
TOTAL
ANGLE
72°
36°
18°
144°
90°
360°
Draw a piechart with the above angles and write the
labels and title.
Q. 23
Q. 24 MODE: No mode
MEDIAN: 5
MEAN: 11
RANGE: 44
MEDIAN is more appropriate average since it is a central
value.
Q. 25 a) ½
Q. 26 a= 3 ;
(b) ½
t=4
; y=9 .
Q. 27
Equation 7n – 48 = 3n
n = 12
Q. 28 a (i) 1/8 (ii) 7/8
(iii) ½ (iv) ½
(v) 3/8 (vi) 5/8
b (i) 1
(ii) 1 (iii) 1
c Those two are exhaustive events and adds up to 1.
Q29 0.2133
0.17
1/6 or 0.1667
400 x 0.17 = 68
Q30
1
2
3
4
5
6
1
2
3
4
5
6
7
2
3
4
5
6
7
8
3
4
5
6
7
8
9
4
5
6
7
8
9
10
5
6
7
8
9
10 11
6
7
8
9
10 11 12
Total outcomes 36
(i)
(ii)
(iii)
(iv)
10/36 = 5/18
5/36
3/36 = 1/12
30/36 = 5/6