Page 215 - Start Up Mathematics_1

Worksheet

Coding and Decoding

The letters of the alphabet are replaced by numbers 1 to 26 as given in the table.

A B C D E F G H I J K L M
1 2 3 4 5 6 7 8 9 10 11 12 13

N O P Q R S T U V W X Y Z
14 15 16 17 18 19 20 21 22 23 24 25 26

1. Write the given messages in code language. The first one is done for you.

(a) HOW ARE YOU? 8 15 23 / 1 18 5 / 25 15 21?

(b) WHAT IS YOUR NAME?

(c) WHERE DO YOU STUDY?

(d) I LOVE MY COUNTRY.

2. Decode and write the messages. The first one is done for you.

(a) 23 5 / 1 18 5 / 9 14 4 9 1 14 19. WE ARE INDIANS.

(b) 18 15 19 5 19 / 1 18 5 / 18 5 4.

(c) 19 8 21 20 / 20 8 5 / 4 15 15 18.

(d) 12 5 20 / 21 19 / 16 12 1 25.

Now play a game of coding and decoding messages with your friends.

207
207