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03
CHALLENGE MISSIONEstimate to check
Multi-digit operations, estimation, and multi-step problems
BRIDGE CHALLENGE - Operations Engine: A student says 39,812 + 21,104 = 50,916. Which estimate shows it is too small? Build an equation or model, solve it, and use an inverse operation or estimate to defend it.
MODELRegrouping Gear
x
PROVEChoose with evidence
CLUE
Pause. Find what matters. Then make your move.
Explain your choice with one detail, calculation, source clue, observation, or test result.
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