SubjectNest · Year 3 maths · Make it fit, then check
Home 27 · Catch a silly total
Try one tiny turn.
Prepare: MODEL batches 163 and 248; reported total 41.
Invitation: Ask whether 41 could be sensible before calculating; then find a useful exact total and check one part.
Adult worked model/check: 163 + 248 = 411; roughly 200 + 200 = 400. 41 loses the hundreds;411 − 248 = 163.
Choice and boundary: Usual communication or exact scribing; no calculator needed, no timed contest.
Usual communication, exact scribing, private/untimed work and stopping are welcome. Keep a model answer separate from your child's own attempt; do not correct it silently. Observe one useful reason and choose a new unrelated example if wanted.