# Concept of Money in Math

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147 Concept of Money

When we go for shopping, we need money to but things. Money is in form of coins or notes.

Key Fact: The unit of money is Rs.

Changing Money

We can exchange one high value coin for other lower value coins.

One 2-rupee coin = two 1-rupee coins

Rs 2 = Re 1 + Re 1

One 2-rupee coin = Five 1-rupee coins

Rs 5 = Re 1 + Re 1+ Re 1+ Re 1+ Re 1

One 10-rupee coin = Two 5-rupee coins

Rs 10 = Re 5 + Re 5

One 10-rupee note = Five 5-rupee coins

Rs 10 = Re 2 + Re 2 + Re 2 + Re 2 + Re 2

One 20-rupee note = Two 10-rupee Notes

Rs 20 = Re 10 + Re 10

One 50-rupee note = Five 10-rupee coins

Rs 50 = Re 10 + Re 10 + Re 10 + Re 10 + Re 10

One 100-rupee note = Five 20-rupee notes

Rs 100 = Re 20 + Re 20 + Re 20 + Re 20 + Re 20

We can also exchange any amount of money for different combinations of coins and notes.

One 20-rupee note = One 10-rupee note and two 5-rupee coins

Rs 20 = Re 10 + Re 5 + Re 5

One 50-rupee note = two 20-rupee notes and one 10-rupee coins

Rs 50 = Re 20 + Re 20 + Re 10

One 100-rupee note = One 50-rupee note, two 20-rupee notes and one 10-rupee coin

Rs 100 = Re 50 + Re 20 + Re 20 + Rs 10