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The word 'sum' means you need to add. If you add 1.22 and 2.3 you get 3.52.

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8y ago
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8y ago

Because 1 plus 2 is not 1. 1.22 plus 2.3 would equal 3.52.

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Q: Why is the sum of 1.22 and 2.3 not 1.45?
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