Page 307 - ICSE Math 8

Subject Integration

RATIONAL NUMBERS

Integrated with Chemistry
When salt is added to water to make saltwater, it becomes a mixture. Given that the quantity of salt and water
2 3
in two glasses is and respectively. Find the percentage of salt in both the above mixtures and tell which
5 8
mixture is more salty?

EXPONENTS AND POWERS

Integrated with Chemistry
Look at the pH scale below and compare the pH of the following:
(a) Lemon juice and Toothpaste (b) Stomach acid and blood
8
7
Note: A pH of 7 means 10 while a pH of 8 represents 10 .
Acidic Neutral Alkaline or Basic

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Battery acid Stomach acid Lemon juice Orange juice Tomato juice Black coffee Milk ‘Pure’ water, blood Baking soda Toothpaste Detergent Cleaners Oven cleaner Caustic soda

SQUARES AND SQUARE ROOTS
D C
Integrated with Architecture
ABCD is a rectangular plot where a building would be built. An architect uses
the concept of squares and square roots in the form of Pythagoras Theorem to 6 m
measure the diagonal AC. Can you find the length of the diagonal AC?
A B
8 m

CHAPTER 4: CUBES AND CUBE ROOTS

Integrated with Daily Life
A cold storage room is in the shape of a cube with length, breadth and height measuring
15 m. The owner wants to know how many cubical blocks of ice measuring 3 m can be
accomodated in the room.

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