Keep both full sides equal and describe what the box counts.
Complete source
An imaginary equation is 900−250=□+328.
Status
Original fictional ordinary practice; teach source/help before any own application.
Title
Shelf puzzle
After own work: adult practice possibility
322; 650=322+328.
About this resourceReviewed source edition
Source review is complete for this two-week edition. Local suitability and classroom use still need review. Earlier candidate or pending-review words are retained in the original files; full-year coverage, translations and audio are not claimed.
Source: https://neuroforge.io/subjectnest/library/resources/year-4/mathematics/term-2/weeks-11-12/ordinary/C16-markdown · SubjectNest by NeuroForgeIO Pty Ltd · Keep the complete source and licence companions; item rights remain separate.