# Estimate and check · e-later

**Show one idea at a time.**

MODEL collection: 4 complete groups of 25 pieces and 7 loose pieces. Two fictional material batches are 426 and 157 pieces. Stock is 600 pieces. A ticket reports the combined batches as 58 pieces. No real class count, purchase or event is asserted.

Usual communication, exact scribing, private/untimed response, rest or pause are welcome. An adult may read/describe all source facts neutrally, without choosing your maths or giving answers. These supplied models do not establish real measuring.

## 1. Estimate the collection using a known group. Explain your clue; keep an estimate different from an exact count.

Own response: [empty before your attempt]

## 2. Before exact addition, give a useful estimate of the two batches and explain a benchmark.

Own response: [empty before your attempt]

## 3. Calculate the exact combined batches. Is stock enough, and what is left?

Own response: [empty before your attempt]

## 4. Explain why 58 needs checking. Use a connected inverse check for your own exact total.

Own response: [empty before your attempt]

[Only this own response aid](../aids/e-later-own.svg) · [only this complete alternative](../aids/e-later-own-alternative.md)