Sarin and his coin bank part5(Math Question)

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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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