SubjectNest · Year 3 maths · Make it fit, then check
Home 28 · One missing piece
Try one tiny turn.
Prepare: MODEL whole 360 cm and known piece 175 cm; words/paper only.
Invitation: Keep the unknown empty until the child tries. Find the missing length and check by addition.
Adult worked model/check: 360 − 175 = 185 cm;175 + 185 = 360.
Choice and boundary: Adult reads wording if wanted without doing the computation first. No actual cord/cutting needed.
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.