Do not send this whole bank or recipe/aid-data to learners. Accept correct alternative reasoning and usual communication; physical presentation, speed and amount written are not maths components.
m-reserve · Mass
Full supplied source: MODEL scale labels 0,100,200,300,400,500 g, with a middle mark in each gap. Pointer is at 450 g. Empty pouch is 90 g and pouch plus pieces is 330 g. Another sealed model package is 310 g. No body weighing or actual local product is involved.
Q1 · Choose a unit and tool for the mass of a small safe package. Explain why.
Worked/acceptable response: g and a scale, for mass; appropriate stable safe familiar tool.
Component: Mass/unit/tool connection
Evidence: independently shown / shown with named cue / partial / not observed. A correct supplied result with adult computation is supported result, not independent reasoning.
Specific unrelated next teaching: Compare attribute questions for a new light object.
Q2 · How big is each marked gap, and what is the pointer reading?
Worked/acceptable response: 50 g gaps; pointer 450 g.
Component: Labelled increment and reading
Evidence: independently shown / shown with named cue / partial / not observed. A correct supplied result with adult computation is supported result, not independent reasoning.
Specific unrelated next teaching: Describe a new scale with 20 g gaps and a new pointer.
Q3 · Find the mass of the pieces without the pouch. Show a connected check.
Worked/acceptable response: 330 − 90 = 240 g; 90 + 240 = 330 g.
Component: Whole/part/net quantity and inverse
Evidence: independently shown / shown with named cue / partial / not observed. A correct supplied result with adult computation is supported result, not independent reasoning.
Specific unrelated next teaching: Draw a new two-part whole including a different tray.
Q4 · Which is heavier: the pointer-reading package or the other package? By how much?
Worked/acceptable response: Pointer package: 450 − 310 = 140 g heavier.
Component: Same-unit comparison and difference
Evidence: independently shown / shown with named cue / partial / not observed. A correct supplied result with adult computation is supported result, not independent reasoning.
Specific unrelated next teaching: Compare two unrelated same-unit readings without judging shape.