Reach for the Star | GCSE Mathematics

L056: Number accuracy pathway

Objective

Select appropriate exact or approximate forms and explain accuracy.

Calculator: Non-calculator core; calculator optional only for checking where labelled.

Visual model for Number accuracy pathway
Points route: Connect 2 · Share 2 · Apply 6 · Review 3 · Stretch 2 · Deep Challenge 3. Record your score honestly after you have checked your answer.

Recall

Retrieve the key fact or method needed for number accuracy pathway.

Core practice

Estimate 398×0.051 to one significant figure, then calculate exactly.

Reasoning

A measurement rounds to 1.20 to two decimal places. State the interval and explain why 1.205 is excluded.

Exam-style

Solve an exam-style problem involving number accuracy pathway. Show working, include a check and interpret your answer.

WWW / EBI

Recall & Review: feedback and extension integration

Lesson L056: Number accuracy pathway

Objective: Select appropriate exact or approximate forms and explain accuracy.

60-minute structure: 0-7 Connect & Check; 7-14 Share; 14-25 Present/model; 25-44 Apply route choice/practice; 44-52 independent exam-style check; 52-60 Recall & Review, WWW/EBI and next step.

What Went Well (WWW)

I selected an efficient numerical method, showed the key steps clearly and checked the sign, size or accuracy of my answer.

Even Better If (EBI)

I will make the place-value, sign or operation decision explicit and use estimation or an inverse calculation to check a fresh question.

Stretch and deep challenge

Stretch: Estimate 398×0.051 to one significant figure, then calculate exactly.

Deep challenge: A measurement rounds to 1.20 to two decimal places. State the interval and explain why 1.205 is excluded.