Ratio notation and equivalent ratios

Watch: Watch whether the learner subtracts each contributor’s own one-wrap share before dividing the coins. The decisive response is Maya 7 and Leo 0, not a split based on the original 2-to-1 contributions.

Misread: A 5/2 or 4/3 split usually means the learner paid for the wraps originally brought; 3.5/3.5 treats equal eating as equal payment. A 0/7 pair reverses the named recipients, while 7/7 ignores the seven-coin total.

Curriculum: This task combines equal sharing with additive comparison: subtract each contributor’s own share to find net supply, then conserve a fixed total across two named amounts. It scores quantitative reasoning about equal groups, subtraction, ownership, and conservation rather than story recall.