Virginia SOL 2.NS.1.g
The Standard
Choose a reasonable estimate up to 1,000 when given a contextual problem (e.g., What would be the best estimate for the number of students in our school – 5, 50, or 500?).
Virginia Standards of Learning for Mathematics · The student will utilize flexible counting strategies to determine and describe quantities up to 200.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students use clues from a familiar situation to select a sensible approximate quantity from several choices. They explain why their choice fits and why other choices are too small or too large.
What Mastery Looks Like
- Given choices such as 8, 80, and 800, a student selects the amount that fits the situation. The student uses familiar benchmarks, such as class size, to justify the choice.
Common Misconceptions
- Students may choose the largest number because the setting seems large, without comparing it to a known group. They may also select an exact-looking answer instead of judging whether the quantity is reasonable.
How to Assess It
- Give this exit ticket: “Our grade has six classes with about 20 students each. Is 10, 100, or 1,000 the best estimate? Explain.”
Lesson moves
Ways to Teach It
Build groups of 10 and 100 linking cubes, then use the models to judge estimates on teacher-read situation cards.
Prompt: Could 700 children fit in our classroom? Students write two sentences using room size and class size as evidence.
Play Estimate Corners: label corners 10, 100, 500, and 1,000, read a scenario, and have students move to their choice.
Compare one class roster with the school enrollment, then choose from 30, 300, or 900 students and explain which estimate fits.
Free download
Printable 2.NS.1.g Worksheet
A ready-to-print activity worksheet aligned to 2.NS.1.g, with an answer key for the teacher on its own page. No account needed.
PDF, US Letter, prints cleanly in black and white.
Download the worksheetKeep exploring
Related Standards
- 4.CE.2.a
Determine and justify whether an estimate or an exact answer is appropriate when solving contextual problems involving multiplication and division of whole numb...
- 3.CE.1.a
Determine and justify whether an estimate or an exact answer is appropriate when solving single-step and multistep contextual problems involving addition and su...
- 1.NS.2.b
Estimate the number of objects (up to 120) in a given collection and justify the reasonableness of an answer.
- 4.CE.1.a
Determine and justify whether an estimate or an exact answer is appropriate when solving contextual problems involving addition and subtraction with whole numbe...
Turn this exact standard into a lesson
Grade, subject, topic, and the complete standard are prefilled. Create one free, no account needed.