Example of estimating differences using compatible numbers and rounding to nearest tens.
A table showing the actual difference of 134 - 67 = 67, and two methods of estimating the difference using compatible numbers: one using numbers ending in the same final digit (134 → 134, 67 → 64, 134 - 64 = 70), and another rounding to the nearest tens (134 → 130, 67 → 70, 130 - 70 = 60).
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