Page 86 - Maths Class 05

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5. Two kinds of fishes can be found in a small tank that is feet long. A blue fish is foot
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long and an orange fish is foot long. How much longer is the orange fish ?
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Multiplication of Fractions

Multiplication of a Fraction by a Whole Number

Repeated addition is called multiplication. In the multiplication of a fraction by a whole

number, we will use the same definition.
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Example : Let us multiply .
× 1
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8 8 1 8 × 1 8
Solution : × 1 = × = =
10 10 1 10 × 1 10

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Example : by 4 = ?
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2 2 2 2 2 2 + 2 + 2 + 2 8 3
Solution : × 4 = + + + = = = 1
5 5 5 5 5 5 5 5

From the above, we see that
Know
Know
Know
Get
Get
to
2 2 × 4 8 3 Get to
× 4 = = = 1
5 5 × 1 5 5
H When we multiply a fraction
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Example : × 0 = ? by 1, we get the same fraction.
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H When we multiply a fraction
4 4 0 4 × 0 0
Solution : × 0 = × = = = 0 by zero, we get zero as the
23 23 1 23 × 1 23
answer.

Example : Simran made burgers for her 10 friends. When they shared the burgers
equally, each of them got half a burger. How many burgers did Simran make ?

Solution : Let us add each person’s share and find out.

1 1 1 1 1
2 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1

2 2 2 2 2

1 1 1 1 1
2 + 2 + 2 + 2 + 2 = 5
1 1 1 1 1
2 2 2 2 2

Mathematics-5 86