Some tricks are really amazing, but others are not.
Some tricks really help fasten my calculation speed, but others are not really helpful. For example, if you say we can multiply a number with 4 by doubling twice, that doesn't really help :-)
4 out of 5
1 ratings in Vietnam
Some tricks really help fasten my calculation speed, but others are not really helpful. For example, if you say we can multiply a number with 4 by doubling twice, that doesn't really help :-)
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30
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31
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