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To do a quick estimate in your head, the idea is to round each number to the nearest multiple of 10, in this case (i.e., to one significant figure). 34 is closer to 30 than to any other multiple of 10; 59 is closest to 60. It should now be easy to add 30 + 60 in your head.

To do a quick estimate in your head, the idea is to round each number to the nearest multiple of 10, in this case (i.e., to one significant figure). 34 is closer to 30 than to any other multiple of 10; 59 is closest to 60. It should now be easy to add 30 + 60 in your head.

To do a quick estimate in your head, the idea is to round each number to the nearest multiple of 10, in this case (i.e., to one significant figure). 34 is closer to 30 than to any other multiple of 10; 59 is closest to 60. It should now be easy to add 30 + 60 in your head.

To do a quick estimate in your head, the idea is to round each number to the nearest multiple of 10, in this case (i.e., to one significant figure). 34 is closer to 30 than to any other multiple of 10; 59 is closest to 60. It should now be easy to add 30 + 60 in your head.

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