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E:\Working\Focus_Learning\Math_Genius-6\Open_Files\17_Answers\Answers
\ 07-Nov-2024 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________

Mental Maths 8. (a)
1. 9 2. 97 3. 10 4. 8 5. 2 6. 4 Y Scale: 1 unit length = 500 km
Brain Sizzlers 3000
1. 11 × 11 = 121, 3 × 7 × 11 × 13 = 3003, 2 × 7 × 11 × 13 = 2002, 2 × 17 × 19 2500

= 646, 3 × 17 × 19 = 969 [Answers may vary] 2000
2. 89, 233 3. 1 4. 3, 18 5. No 1500
Life Skills Length (in km) 1000
1. 7 × 5 2. (b) 500

3. No, as money collected is less than the required money for the 0 X
mentioned number of photographs. Ganga Yamuna Godavari Krishna kaveri
Rivers
Chapter Assessment
A. 1. (c) (b) 1700 km
2. (d) (c) 808,818,828
3. (b) 4. (a) 5. (d)
6. (c) 7. (c) Chapter 6: Perimeter and Area
B. 1. (a) 2. (b) 3. (d) Let’s Recall
C. 1. 39 2. 2
3. Product 4. 5 5. 15 1. (a) Perimeter (b) Perimeter (c) Area (d) Area
D. 1. F 2. T 3. F 4. T 5. F (e) Perimeter (f) Area
E. 1. 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 2. (a) (b) (c) (d) (e)
2. (a) 44 = 3 + 41 or 7 + 37 (b) 50 = 3 + 47 or 19 + 31 Perimeter 16 18 14 26 30
(c) 64 = 3 + 61 or 5 + 59 (d) 88 = 5 + 83 or 17 + 71 (Units)
[Answers may vary] Area 12 16 8 17 14
3. (a) 63 = 3 + 29 + 31 (b) 79 = 3 + 5 + 71 (c) 15 = 3 + 5 + 7 (Sq. units)
(d) 31 = 7 + 11 + 13 [Answers may vary] Quick Check
4. (a) 1, 3, 5, 15 (b) 1, 2 (c) 1, 2, 3, 6 1. 205 m 2. 40 m
5. (a) 30, 60, 90, 120, 150 (b) 60, 120, 180, 240, 300 Think and Answer
(c) 35, 70, 105, 140, 175 (d) 120, 240, 360, 480, 600
6. (a) 24 = 2 × 2 × 2 × 3 (b) 364 = 2 × 2 × 7 × 13 40 cm
(c) 1000 = 2 × 2 × 2 × 5 × 5 × 5 (d) 162 = 2 × 3 × 3 × 3 × 3 Think and Answer
7. 37 (2 + 30 + 5) 1. Shreya by 280 m.
8. (13, 31), (17, 71), (37, 73), (79, 97); 4 2.
9. 12 10. 1 11. (a) 18 (b) 25 12. 6
80 m
Model Test Paper – 1 S 70 m R
A. 1. (d) 2. (d) 3. (c) 4. (a) 5. (b)
6. (d) 7. (b) 8. (c) 9. (a) 10. (c) 40 m
B. 1. 36 2. coplanar 3. palindromic Starting point
4. Five 5. 19 50 m for Shreya
C. 1. F 2. T 3. T 4. F 5. T
D. 1. (a) 172 (b) 148 Q
2 × 86 2 × 74 Starting point
P for Mukulika
2 × 43 2 × 37
(c) Mukulika finished 3 full rounds.
Prime factorisation of 172 Prime factorisation of 148
= 2 × 2 × 43 = 2 × 2 × 37 Shreya finished 4 full rounds.
2. 81 litres Practice Time 6A
3. (a) T is the mid point of side PS.
N is the mid point of side QR. 1. (a) 52 cm (b) 88 cm
L is the mid point of side PQ. 2. (a) 60 cm (b) 44 m
(b) l is the perpendicular bisector of line PQ. 3. (a) 30 cm (b) 36 cm (c) 26 cm (d) 102 cm
m is the perpendicular bisector of line QR. 4. (a) 54 cm (b) 60 cm (c) 45 cm (d) 48 cm
n is the perpendicular bisector of line PS. The square with a side of 15 cm has the Largest Perimeter.
4. 6336 5. (a) 1 (b) 8 5. 8 m 80 cm 6. 8 m 7. Fencing a square field; `100
6. (a) 2024 ; 16 symbols (b) 45 symbols 8. `7200 9. (a) 14 cm (b) 6 cm
7. 12 10. Breadth = 13 m 11. 324 m

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