Page 19 - Touchpad_Plus_V3.2_Class 7
P. 19
SDG Activity
You are in charge of decorating your school’s Annual Day event with a limited
budget. To ensure efficient use of resources, make a list of supplies with their
quantities and calculate the total cost. Convert the total price into binary and
count the number of digits. Compare whether there are more digits in the
decimal or binary representation.
21 st
Century #Communication
Skills
Organise a group discussion and discuss about the various number systems.
21 st #Technology Literacy
Century
Lab Session Skills #Information Literacy
Solve the following:
1. Convert (10111011) into its decimal equivalent.
2
2. Subtract (1101) from (100110) .
2 2
3. Add the following binary numbers.
a. (1000) and (101) b. (1011) and (101) c. (1001) and (101)
2 2 2 2 2 2
d. (1111) and (1111) e. (11001) and (10101)
2 2 2 2
4. Convert the following decimal numbers into binary.
a. (19) b. (98) c. (75)
10 10 10
d. (37) e. (54)
10 10
Teacher's Note
1. Talk to the children about the importance of number systems and their use in computers.
2. Do a detailed walk-through of the decimal and binary number systems and their different operations in a
mathematically rigorous manner.
3. Give a brief on octal and hexadecimal number systems.
Number System 17

