English example sentences with "abacus"

In Japan, we still sometimes see someone use an abacus, but not as often as we used to.
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A calculator is more efficient than an abacus.
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A "soroban" is a type of Japanese abacus.
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No, I just thought that since you can use an abacus, you might be good at doing calculations in your head.
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An abacus is a tool used in counting.
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The abacus is a Chinese invention.
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The abacus was widely used in the Middle Ages.
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The abacus is a calculating tool.
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The first calculating tool of mankind is called an abacus.
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What is an abacus used for?
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This is an abacus.
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What is an abacus?
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Do you know what an abacus is?
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What's an abacus?
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Our school has an abacus.
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Tom knows how to use an abacus.
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The abacus was invented over five thousand years ago.
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How does the abacus work?
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Do you know how to use an abacus?
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Few people use an abacus these days.
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Not many people use an abacus these days.
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The abacus was used a lot in the Middle Ages.
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I know how to add numbers on an abacus.
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I know how to do addition on an abacus.
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An abacus is a calculator.
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