Our top 5% students will be awarded a special scholarship to Lido.

Ncert solutions

CHAPTERS

Q5) Find the number of right angles turned through by the hour hand of a clock when

it goes from

(a) 3 to 6 (b) 2 to 8 (c) 5 to 11

(d) 10 to 1 (e) 12 to 9 (f) 12 to 65

SOLUTION:

i) 3 to 6

here, the hour hand moves from 3 to 6. it starts from 3 and covers digits 4, 5 and 6.

so, the hour hand-turned by one right angle.

ii) 2 to 8

here, the hour hand turns from 2 to 8. it starts from 2 and covers digits 3,4,5,6,7 and 8. so, the hour hand-turned by two right angles.

iii) 5 to 11

here, the hour hand turns from 5 to 11. it starts from 5 and covers digit 6, 7, 8,9,10 and 11. so, the hour hand-turned by two right angles.

iv)10 to 1

here, the hour hand turns from 10 to 1. it starts from 10 and covers digit 11, 12 and 1. so, the hour hand-turned by one right angle.

v) 12 to 9

here, the hour hand turns from 12 to 9. it starts from 12 and covers digits 1,2,3,4,5,6,7,8 and 9. so, the hour hand-turned by three right angles.

vi) 12 to 6

here, the hour hand turns from 12 to 6. it starts from 12 and covers digits 1,2,3,4,5 and 6. so, the hour hand turned by two right angles.

Q5) Find the number of right angles turned through by the hour hand of a clock when

it goes from

(a) 3 to 6 (b) 2 to 8 (c) 5 to 11

(d) 10 to 1 (e) 12 to 9 (f) 12 to 65

SOLUTION:

i) 3 to 6

here, the hour hand moves from 3 to 6. it starts from 3 and covers digits 4, 5 and 6.

so, the hour hand-turned by one right angle.

ii) 2 to 8

here, the hour hand turns from 2 to 8. it starts from 2 and covers digits 3,4,5,6,7 and 8. so, the hour hand-turned by two right angles.

iii) 5 to 11

here, the hour hand turns from 5 to 11. it starts from 5 and covers digit 6, 7, 8,9,10 and 11. so, the hour hand-turned by two right angles.

iv)10 to 1

here, the hour hand turns from 10 to 1. it starts from 10 and covers digit 11, 12 and 1. so, the hour hand-turned by one right angle.

v) 12 to 9

here, the hour hand turns from 12 to 9. it starts from 12 and covers digits 1,2,3,4,5,6,7,8 and 9. so, the hour hand-turned by three right angles.

vi) 12 to 6

here, the hour hand turns from 12 to 6. it starts from 12 and covers digits 1,2,3,4,5 and 6. so, the hour hand turned by two right angles.

Lido

Courses

Quick Links

Terms & Policies

Terms & Policies

2021 © Quality Tutorials Pvt Ltd All rights reserved