0 Grade 3 missions
Rounding Ridge · Challenge
Mission 3 of 3123
Estimate BeaconUse estimation to check reasonableness
MISSION TEXT
A student says 1,978 + 2,143 = 7,121. Rounded to the nearest thousand, the addends are about 2,000 and 2,000. A reasonable exact total should therefore be near 4,000.
Which evaluation is best?
Show the rounded estimate and one exact addition step that proves the error.
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