You can read posting **Sarin and his coin bank** on the story of coin bank. Read also posting on **Sarin and the million numbers** to understand concept of dollars.

Lower primary school mathematics question LPQ12

Sarin had twenty 50-cent coins in his coin bank. He bought a notebook for $2.90 and two erasers at 80 cents each. How many 50-cent coins did he have left?

Solution:

For $1.00 = 100 cents,

80cents = $0.80

Total money he spent $2.90 + 2 × $0.80 = $4.50

Number of 50-cent coins he used was $4.50 ÷ $0.50 = 9

Number of 50-cent coins he left was 20 – 9 = 11

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