Teaching article
An estimate should have a reason behind it
Make an estimate before counting and compare it with the checked quantity.
Offer a quantity or length that can later be checked and ask for a useful reference. The goal is a reasoned starting judgement, with room to revise it once counting or measurement supplies more information.
Seeing one group of five can help estimate a larger collection without pretending the estimate is an exact count.
Explain the reference, then check
State what is being estimated and use a known reference. An estimate should be revisable after measurement or counting rather than treated as a random guess.
Identify a small reference group. Predict the approximate total. Count and discuss the difference.
What reference supported the estimate? Keep the collection visible throughout.
An estimate is not simply an unchecked answer.
Resources
- Maths Puzzle Generator — Choose arithmetic or missing-number questions only when they match the number relationship being explored.
Further reading
Read next
- One object, one count: make the correspondence visible
- Teen numbers as a ten and some more
- Doubles facts with two equal groups underneath them
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