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Complete.
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In this question, we have to add together these three amounts of coins to find the total number of piastres.
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There are two one-pound coins.
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We know that one pound is worth 100 piastres, so two pound coins are worth 200 piastres.
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Next, we need to add our three 50-piastre coins.
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50 plus 50 is 100.
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100 plus 50 is 150.
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Now we need to add all three 25-piastre coins.
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25 plus 25 is 50.
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50 plus 25 is 75.
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Let’s use a number line to help us add 200, 150, and 75.
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200 plus 100 takes us to 300, and 50 more takes us to 350.
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We’ve added our first two groups of coins.
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Now what we need to do is add 75.
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Let’s partition our 75 into 50 and 25.
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50 more than 350 is 400.
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Now we just need to add our 25.
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400 plus 25 takes us to 425.
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If we add together two one-pound coins plus three 50-piastre coins plus three 25-piastre coins, the total number of piastres is 425.